Year	current US$
1993	2149396.73315351
1994	2731292.39991894
1995	4303793.26626137
1996	4223449.31519068
1997	3583227.05763685
1998	2876110.33855073
1999	1524675.89455127
2000	1481663.8315628
2001	1669162.95122014
2002	1811038.08016406
2003	2550814.75824541
2004	2742843.71701454
2005	1753493.96552438
2006	1961169.43614143
2007	2840088.37321873
2008	4647938.46683467
2009	4220808.53378334
2010	3979633.29658984
2011	5129264.49627171
2012	4062583.24319369
2013	3522778.17075951
2014	5103625.33031225
2015	3792719.44513106
2016	4233058.60768524
2017	4731100.0963268
2018	2105270.2365489
2019	1826186.85673064
2020	2331453.02098275
2021	1945293.02729534