Year	current US$
1980	37000000
1981	29000000
1982	17000000
1983	23000000
1984	41000000
1985	23000000
1986	65000000
1987	29000000
1988	31000000
1989	50000000
1990	60000000
1991	55000000
1992	85000000
1993	35000000
1994	32000000
1995	56000000
1996	68000000
1997	57000000
1998	45000000
1999	51000000
2000	51000000
2001	36000000
2002	56000000
2003	52000000
2004	73000000
2005	49000000
2006	27000000
2007	27000000
2008	24000000
2009	29000000
2010	15000000
2011	13000000
2012	11000000
2013	12000000
2014	22000000
2015	22000000
2016	19000000
2017	18000000
2018	18000000
2019	27000000
2020	19000000
2021	29000000
2022	34000000
2023	27000000