Year	current US$
1995	14529000000
1996	13980000000
1997	12275000000
1998	12694000000
1999	12358000000
2000	11382000000
2001	11511000000
2002	12334000000
2003	15128000000
2004	17251000000
2005	18471000000
2015	20422000000
2016	20965000000
2017	22424000000
2018	25413000000
2019	25924000000
2020	15362000000