Year	current US$
1996	709049354950.87
1997	609518271972.354
1998	476456215642.393
1999	449489307821.336
2000	515408949027.634
2001	390972430411.083
2002	312414271067.803
2003	358339995792.394
2004	428840617616.674
2005	423288776120.544
2006	394263895897.313
2007	402736763075.472
2008	307396742041.309
2009	90458802426.2642
2010	225753205899.37
2011	200377039987.791
2012	189684900045.761
2013	174149320664.617
2014	175284166362.485
2015	279339488633.694
2016	352439919941.369
2017	374237709265.827
2018	356813537054.256
2019	353047402930.168
2020	247272983451.681
2021	182142111391.38