Year	current US$
1990	6912421.63825003
1991	5458540.47659183
1992	5020374.88136442
1993	4595249.64782942
1994	4996027.97373203
1995	5397046.32442408
1996	5572368.83083224
1997	6368410.28751043
1998	6288025.08832078
1999	6190355.62047738
2000	6366333.19052618
2001	6294456.5086493
2002	6179571.3348666
2003	6545070.30389892
2004	6725997.63346134
2005	7061605.58703878
2006	6924548.76234507
2007	8111347.57698295
2008	8160982.84157109
2009	7728876.50852256
2010	8970752.24186911
2011	10027242.8709334
2012	9091295.26175443
2013	10086642.0734599
2014	11292476.853722
2015	11027466.3575563
2016	11124319.9578939
2017	12142886.7970043
2018	12021417.3017719
2019	11997166.4799506
2020	12314184.3180217
2021	12986616.7543222