Year	current US$
1992	28000000
1993	29000000
1994	10000000
1995	8000000
1996	17000000
1997	6000000
1998	14170000.076293899
1999	23760000.2288818
2000	44720001.220703095
2001	42259998.3215332
2002	61790000.9155273
2003	39990001.6784668
2004	40310001.373291
2005	36029998.779296905
2006	40580001.8310547
2007	32119998.931884803
2008	35889999.3896484
2009	33000000
2010	28399999.6185303
2011	24469999.3133545
2012	20360000.6103516
2013	21889999.3896484
2014	17750000
2015	16280000.6866455
2016	17479999.5422363
2017	21459999.084472697
2018	21120000.8392334
2019	17040000.915527303
2020	15979999.5422363
2021	12600000.3814697
2022	12310000.4196167