Year	current US$
1990	19621291.8052121
1991	20115569.8324785
1992	20456810.398704
1993	21235982.9108607
1994	22461147.6974433
1995	23647762.4765548
1996	25006779.7575231
1997	25286727.8269287
1998	19579771.2061391
1999	22095277.3220006
2000	19864487.7450439
2001	18089769.7505559
2002	18472503.2612306
2003	22275677.6847519
2004	23849088.44924
2005	26049426.1352001
2006	26827588.3236582
2007	29738648.1363684
2008	30768688.2871989
2009	24287459.1980846
2010	24964147.992202
2011	28010363.0293706
2012	26682029.2849645
2013	24931069.4016721
2014	25513079.1289168
2015	23761088.0223319
2016	25257684.5037229
2017	26798405.7668631
2018	27550023.2370332
2019	27678756.0613955
2020	26524792.9030343
2021	25505663.1411524