pre_text: the fair value of our total investments increased $ 4.8 billion during 2010 , primarily due to unrealized appreciation , the inves- ting of operating cash flows , and the portfolios acquired in the 2010 corporate acquisitions . the following tables show the market value of our fixed maturities and short-term investments at december 31 , 2010 and 2009 . the first table lists investments according to type and the second according to s&p credit rating. .
post_text: .
table: 2010 2009
table: (in millions of U.S. dollars, except for percentages) Market Value Percentage of Total Market Value Percentageof Total
table: Treasury $2,075 4% $2,068 5%
table: Agency 2,015 4% 2,698 6%
table: Corporate and asset-backed securities 15,900 33% 13,537 30%
table: Mortgage-backed securities 12,362 25% 11,311 25%
table: Municipal 2,449 5% 2,300 5%
table: Non-U.S. 12,199 25% 11,172 25%
table: Short-term investments 1,983 4% 1,667 4%
table: Total $48,983 100% $44,753 100%
table: AAA $23,718 48% $22,884 51%
table: AA 4,714 10% 4,021 9%
table: A 8,482 17% 7,461 17%
table: BBB 5,487 11% 4,910 11%
table: BB 3,357 7% 2,866 6%
table: B 2,393 5% 2,029 5%
table: Other 832 2% 582 1%
table: Total $48,983 100% $44,753 100%
question: Analyse this data from a financial earnings document. what is the percentage change in the balance of treasury in 2010?