Year	current US$
1997	1463118781.68472
1998	1313319378.96406
1999	983761417.197824
2000	1069953762.03106
2001	1248981739.35398
2002	1304676310.67428
2003	1606231130.94739
2004	1831985126.29704
2005	2080691877.10429
2006	2491428373.98951
2007	3395352630.06916
2008	4275262234.96433
2009	3903436687.97259
2010	3673209965.91297
2011	4541967184.4249
2012	5553613411.95788
2013	5598239530.97203
2014	5721254369.3012
2015	5058924142.02665
2016	5387624795.72048
2017	5946603836.81167
2018	6768419468.02551
2019	6423889939.26228
2020	6122247982.02404
2021	5963757454.21255