Year	current US$
1995	30411000000
1996	31884000000
1997	31415000000
1998	31339000000
1999	29570000000
2000	28712000000
2001	26924000000
2002	28213000000
2003	32623000000
2004	37893000000
2005	38364000000
2006	41666000000
2007	46134000000
2015	41415000000
2016	42423000000
2017	46719000000
2018	51602000000
2019	51910000000
2020	20459000000