Year	current US$
1998	3312881156.14418
1999	2521247890.46497
2000	2664441773.37889
2001	2787356356.7282
2002	2926178836.73023
2003	3420101162.80829
2004	4502874230.662
2005	5624771946.68226
2006	6884591109.9297
2007	8864402851.63539
2008	11093462837.0943
2009	9280623468.01285
2010	10276863401.8039
2011	12586125897.104
2012	14039474148.3296
2013	14514873706.5824
2014	15022663537.5334
2015	12416573085.0577
2016	12150187537.251
2017	13075896029.1728
2018	14398969483.7708
2019	14144523113.0185
2020	13028102734.3824
2021	15149562720.8697