Year	current US$
1970	4789999.96185303
1992	33950000.762939505
1993	24149999.6185303
1994	21750000
1995	26110000.6103516
1996	19059999.4659424
1997	20700000.762939498
1998	21000000
1999	19000000
2000	22680000.3051758
2001	21780000.6866455
2002	25530000.6866455
2003	26770000.4577637
2004	28260000.2288818
2005	27709999.084472697
2006	28319999.6948242
2007	31149999.6185303
2008	41639999.3896484
2009	42130001.0681152
2010	45040000.9155273
2011	50900001.5258789
2012	54252075.1953125
2013	24083656.311035197
2014	31223192.214965798
2015	35994480.133056596
2016	36508365.6311035
2017	39971256.2561035
2018	46733692.169189505
2019	60126361.8469238
2020	45550647.7355957
2021	44342510.2233887
2022	50602130.8898926