Year	current US$
1988	110000000
1995	300000000
1996	514000000
1997	1126700000
1999	78300000
2000	4900000
2001	908500000
2002	30100000
2006	214600000
2008	315300000
2009	149000000
2010	343000000
2011	370000000
2012	49700000
2013	46670000
2014	837100000
2015	1023900000
2016	2471900000
2017	53550000
2019	1733250000
2021	1860000000
2022	2170000000