Year	current US$
1995	4957000000
1996	5650000000
1997	7002000000
1998	7177000000
1999	5203000000
2000	7636000000
2001	10067000000
2002	11901000000
2003	13203000000
2004	15888000000
2005	19191000000
2006	17457000000
2007	19430000000
2008	23365000000
2009	22980000000
2010	22585000000
2011	25054000000
2012	25345000000
2013	27997000000
2014	29552000000
2015	26616000000
2016	18743000000
2017	22478000000
2018	25220000000
2019	29829000000
2020	10220000000