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.


increased over 4% ( 4 % ) in 2005 , costs for trucking services provided by intermodal carriers remained flat as we substantially reduced expenses associated with network inefficiencies . higher diesel fuel prices increased sales and use taxes in 2005 , which resulted in higher state and local taxes . other contract expenses for equipment maintenance and other services increased in 2005 . the 2005 january west coast storm and hurricanes katrina and rita also contributed to higher expenses in 2005 ( net of insurance settlements received ) . partially offsetting these increases was a reduction in relocation expenses as we incurred higher relocation costs associated with moving support personnel to omaha , nebraska during 2004 . non-operating items millions of dollars 2006 2005 2004 % (  % ) change 2006 v 2005 % (  % ) change 2005 v 2004 . <table class='wikitable'><tr><td>1</td><td>millions of dollars</td><td>2006</td><td>2005</td><td>2004</td><td>% (  % ) change 2006 v 2005</td><td>% (  % ) change 2005 v 2004</td></tr><tr><td>2</td><td>other income</td><td>$ 118</td><td>$ 145</td><td>$ 88</td><td>( 19 ) % (  % )</td><td>65% ( 65 % )</td></tr><tr><td>3</td><td>interest expense</td><td>-477 ( 477 )</td><td>-504 ( 504 )</td><td>-527 ( 527 )</td><td>-5 ( 5 )</td><td>-4 ( 4 )</td></tr><tr><td>4</td><td>income taxes</td><td>-919 ( 919 )</td><td>-410 ( 410 )</td><td>-252 ( 252 )</td><td>124</td><td>63</td></tr></table> other income 2013 lower net gains from non-operating asset sales and higher expenses due to rising interest rates associated with our sale of receivables program resulted in a reduction in other income in 2006 , which was partially offset by higher rental income for the use of our right-of-way ( including 2006 settlements of rate disputes from prior years ) and cash investment returns due to higher interest rates . in 2005 , other income increased largely as a result of higher gains from real estate sales partially offset by higher expenses due to rising interest rates associated with our sale of receivables program . interest expense 2013 lower interest expense in 2006 and 2005 was primarily due to declining weighted-average debt levels of $ 7.1 billion , $ 7.8 billion , and $ 8.1 billion in 2006 , 2005 , and 2004 , respectively . a higher effective interest rate of 6.7% ( 6.7 % ) in 2006 , compared to 6.5% ( 6.5 % ) in both 2005 and 2004 , partially offset the effects of the declining debt level . income taxes 2013 income tax expense was $ 509 million higher in 2006 than 2005 . higher pre-tax income resulted in additional taxes of $ 414 million and $ 118 million of the increase resulted from the one-time reduction in 2005 described below . our effective tax rate was 36.4% ( 36.4 % ) and 28.6% ( 28.6 % ) in 2006 and 2005 , respectively . income taxes were greater in 2005 than 2004 due to higher pre-tax income partially offset by a previously reported reduction in income tax expense . in our quarterly report on form 10-q for the quarter ended june 30 , 2005 , we reported that the corporation analyzed the impact that final settlements of pre-1995 tax years had on previously recorded estimates of deferred tax assets and liabilities . the completed analysis of the final settlements for pre-1995 tax years , along with internal revenue service examination reports for tax years 1995 through 2002 were considered , among other things , in a review and re-evaluation of the corporation 2019s estimated deferred tax assets and liabilities as of september 30 , 2005 , resulting in an income tax expense reduction of $ 118 million in .
Question: what is the other income in 2006?
Answer: 118.0
Question: what about in 2005?
Answer: 145.0
Question: what is the sum for these two years?

263.0