Year	constant 2015 US$
1997	5813276980.424143
1998	5960668746.960488
1999	6421586212.37689
2000	7445350052.549629
2001	8184512232.32645
2002	8725301137.319134
2003	9070508078.782778
2004	9464770125.426218
2005	10034094753.10751
2006	10535590538.110025
2007	11462840157.652548
2008	12740506152.540115
2009	12881993877.346807
2010	12813100623.980053
2011	13167473775.1843
2012	12915673254.184273
2013	13054626836.720184
2014	13210016148.387775
2015	13393722631.505028
2016	13657645861.27011
2017	14057686584.771812
2018	14394543752.200167
2019	14740245291.801868
2020	14321044598.222893
2021	15484753806.842499