Year	current US$
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	10259286600.496277
2012	16067394957.983194
2013	16239065525.092508
2014	21129157230.330482
2015	26269302133.86989
2016	27748923237.636707
2017	31435988584.46857
2018	29265695241.813824
2019	33822606565.61345
2020	32920623983.15628
2021	31181473945.499615
2022	32127031992.435413
2023	36294219987.49431