Year	current US$
1997	16670284214121.332
1998	17005692240536.135
1999	17968720671774.004
2000	18427116783053.836
2001	18548561160530.73
2002	19522040324445.08
2003	21791253143142.82
2004	24138372245032.402
2005	25512884829333.875
2006	26784317675250.645
2007	29304605646667.703
2008	31342597308745.39
2009	30214113982072.84
2010	31352862780281.195
2011	33547277908438.92
2012	33699010063502.14
2013	34106411652626.125
2014	34806983224437.402
2015	33144240265053.246
2016	33978365737801.9
2017	35270914358739.21
2018	37260565421518.99
2019	37899228798078.43
2020	37327417331484.37
2021	41090966226487.695