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: the breakdown of aes 2019s gross margin for the years ended december 31 , 2000 and 1999 , based on the geographic region in which they were earned , is set forth below. . <table class='wikitable'><tr><td>1</td><td>north america</td><td>2000 $ 844 million</td><td>% (  % ) of revenue 25% ( 25 % )</td><td>1999 $ 649 million</td><td>% (  % ) of revenue 32% ( 32 % )</td><td>% (  % ) change 30% ( 30 % )</td></tr><tr><td>2</td><td>south america</td><td>$ 416 million</td><td>36% ( 36 % )</td><td>$ 232 million</td><td>28% ( 28 % )</td><td>79% ( 79 % )</td></tr><tr><td>3</td><td>caribbean*</td><td>$ 226 million</td><td>21% ( 21 % )</td><td>$ 75 million</td><td>24% ( 24 % )</td><td>201% ( 201 % )</td></tr><tr><td>4</td><td>europe/africa</td><td>$ 371 million</td><td>29% ( 29 % )</td><td>$ 124 million</td><td>29% ( 29 % )</td><td>199% ( 199 % )</td></tr><tr><td>5</td><td>asia</td><td>$ 138 million</td><td>22% ( 22 % )</td><td>$ 183 million</td><td>37% ( 37 % )</td><td>( 26% ( 26 % ) )</td></tr></table> * includes venezuela and colombia . selling , general and administrative expenses selling , general and administrative expenses increased $ 11 million , or 15% ( 15 % ) , to $ 82 million in 2000 from $ 71 million in 1999 . selling , general and administrative expenses as a percentage of revenues remained constant at 1% ( 1 % ) in both 2000 and 1999 . the increase is due to an increase in business development activities . interest expense , net net interest expense increased $ 506 million , or 80% ( 80 % ) , to $ 1.1 billion in 2000 from $ 632 million in 1999 . interest expense as a percentage of revenues remained constant at 15% ( 15 % ) in both 2000 and 1999 . interest expense increased primarily due to the interest at new businesses , including drax , tiete , cilcorp and edc , as well as additional corporate interest costs resulting from the senior debt and convertible securities issued within the past two years . other income , net other income increased $ 16 million , or 107% ( 107 % ) , to $ 31 million in 2000 from $ 15 million in 1999 . other income includes foreign currency transaction gains and losses as well as other non-operating income . the increase in other income is due primarily to a favorable legal judgment and the sale of development projects . severance and transaction costs during the fourth quarter of 2000 , the company incurred approximately $ 79 million of transaction and contractual severance costs related to the acquisition of ipalco . gain on sale of assets during 2000 , ipalco sold certain assets ( 2018 2018thermal assets 2019 2019 ) for approximately $ 162 million . the transaction resulted in a gain to the company of approximately $ 31 million . of the net proceeds , $ 88 million was used to retire debt specifically assignable to the thermal assets . during 1999 , the company recorded a $ 29 million gain ( before extraordinary loss ) from the buyout of its long-term power sales agreement at placerita . the company received gross proceeds of $ 110 million which were offset by transaction related costs of $ 19 million and an impairment loss of $ 62 million to reduce the carrying value of the electric generation assets to their estimated fair value after termination of the contract . the estimated fair value was determined by an independent appraisal . concurrent with the buyout of the power sales agreement , the company repaid the related non-recourse debt prior to its scheduled maturity and recorded an extraordinary loss of $ 11 million , net of income taxes. .
Question: what is the south america percent of revenue 25%?
Answer: 0.36
Question: what is the south america percent of revenue 32%
Answer: 0.28
Question: what is the difference in percents?

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