Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: part i berths at the end of 2011 . there are approximately 10 ships with an estimated 34000 berths that are expected to be placed in service in the north american cruise market between 2012 and 2016 . europe in europe , cruising represents a smaller but growing sector of the vacation industry . it has experienced a compound annual growth rate in cruise guests of approximately 9.6% ( 9.6 % ) from 2007 to 2011 and we believe this market has significant continued growth poten- tial . we estimate that europe was served by 104 ships with approximately 100000 berths at the beginning of 2007 and by 121 ships with approximately 155000 berths at the end of 2011 . there are approximately 10 ships with an estimated 28000 berths that are expected to be placed in service in the european cruise market between 2012 and 2016 . the following table details the growth in the global , north american and european cruise markets in terms of cruise guests and estimated weighted-average berths over the past five years : global cruise guests ( 1 ) weighted-average supply of berths marketed globally ( 1 ) north american cruise guests ( 2 ) weighted-average supply of berths marketed in north america ( 1 ) european cruise guests ( 3 ) weighted-average supply of berths marketed in europe ( 1 ) . <table class='wikitable'><tr><td>1</td><td>year</td><td>global cruiseguests ( 1 )</td><td>weighted-averagesupplyofberthsmarketedglobally ( 1 )</td><td>northamericancruiseguests ( 2 )</td><td>weighted-average supply ofberths marketedin northamerica ( 1 )</td><td>europeancruiseguests</td><td>weighted-averagesupply ofberthsmarketed ineurope ( 1 )</td></tr><tr><td>2</td><td>2007</td><td>16586000</td><td>327000</td><td>10247000</td><td>212000</td><td>4080000</td><td>105000</td></tr><tr><td>3</td><td>2008</td><td>17184000</td><td>347000</td><td>10093000</td><td>219000</td><td>4500000</td><td>120000</td></tr><tr><td>4</td><td>2009</td><td>17340000</td><td>363000</td><td>10198000</td><td>222000</td><td>5000000</td><td>131000</td></tr><tr><td>5</td><td>2010</td><td>18800000</td><td>391000</td><td>10781000</td><td>232000</td><td>5540000</td><td>143000</td></tr><tr><td>6</td><td>2011</td><td>20227000</td><td>412000</td><td>11625000</td><td>245000</td><td>5894000</td><td>149000</td></tr></table> ( 1 ) source : our estimates of the number of global cruise guests , and the weighted-average supply of berths marketed globally , in north america and europe are based on a combination of data that we obtain from various publicly available cruise industry trade information sources including seatrade insider and cruise line international association . in addition , our estimates incorporate our own statistical analysis utilizing the same publicly available cruise industry data as a base . ( 2 ) source : cruise line international association based on cruise guests carried for at least two consecutive nights for years 2007 through 2010 . year 2011 amounts represent our estimates ( see number 1 above ) . ( 3 ) source : european cruise council for years 2007 through 2010 . year 2011 amounts represent our estimates ( see number 1 above ) . other markets in addition to expected industry growth in north america and europe as discussed above , we expect the asia/pacific region to demonstrate an even higher growth rate in the near term , although it will continue to represent a relatively small sector compared to north america and europe . we compete with a number of cruise lines ; however , our principal competitors are carnival corporation & plc , which owns , among others , aida cruises , carnival cruise lines , costa cruises , cunard line , holland america line , iberocruceros , p&o cruises and princess cruises ; disney cruise line ; msc cruises ; norwegian cruise line and oceania cruises . cruise lines compete with other vacation alternatives such as land-based resort hotels and sightseeing destinations for consum- ers 2019 leisure time . demand for such activities is influ- enced by political and general economic conditions . companies within the vacation market are dependent on consumer discretionary spending . operating strategies our principal operating strategies are to : and employees and protect the environment in which our vessels and organization operate , to better serve our global guest base and grow our business , order to enhance our revenues while continuing to expand and diversify our guest mix through interna- tional guest sourcing , and ensure adequate cash and liquidity , with the overall goal of maximizing our return on invested capital and long-term shareholder value , our brands throughout the world , revitalization of existing ships and the transfer of key innovations across each brand , while expanding our fleet with the new state-of-the-art cruise ships recently delivered and on order , by deploying them into those markets and itineraries that provide opportunities to optimize returns , while continuing our focus on existing key markets , support ongoing operations and initiatives , and the principal industry distribution channel , while enhancing our consumer outreach programs. .
Question: what were the number of berths in 2011?
Answer: 155000.0
Question: what were the number of berths in 2007?
Answer: 100000.0
Question: what is the net change in berths?
Answer: 55000.0
Question: what is the percent change?

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