Year	current US$
1990	8892520.13581169
1991	9463449.36502676
1992	10721714.3435439
1993	10374117.8828044
1994	11447593.1851352
1995	14185996.9249769
1996	14510690.1810787
1997	13974720.30194
1998	14334649.6336253
1999	14213871.981693
2000	12857805.0764552
2001	12984684.7082305
2002	14009607.9628877
2003	18753709.154041
2004	20681780.9459585
2005	21458525.1878531
2006	21961442.172928
2007	26747052.0913964
2008	31982723.1872871
2009	30486271.989496
2010	30277249.5609053
2011	29791605.3783088
2012	26165101.0975577
2013	25400520.9957739
2014	23121418.2721186
2015	18088115.9753961
2016	16731073.5460805
2017	16959728.6706185
2018	19646727.2532058
2019	20887049.9175837
2020	22151172.4872875
2021	24843216.0698457