Year	current US$
2000	15205983.6842634
2001	16571940.7321017
2002	18384455.7561708
2003	16814848.023049
2004	18613352.0573806
2005	20798593.1999757
2006	20762430.2995485
2007	21306731.8854327
2008	20839891.9335856
2009	19341355.586597
2010	20432093.6446597
2011	21854450.9919602
2012	23438775.9268657
2013	23660500.4177419
2014	26367459.2581637
2015	31445472.6226267
2016	33550615.1261306
2017	32117044.0378028
2018	31342833.3232174
2019	30681616.6525959
2020	27936319.6666428
2021	22914446.3441211