Year	constant 2015 US$
1990	4537297997.920489
1991	5152022379.90291
1992	5259904838.845165
1993	5011603071.632077
1994	4722265739.743946
1995	4603697590.611455
1996	6259226267.864393
1997	5159828102.759064
1998	4817402463.0472555
1999	5077791259.306904
2000	5286842602.116602
2001	5487666339.87239
2002	6139706453.766165
2003	6261664366.210637
2004	7017511310.989641
2005	7968383988.692614
2006	8720493764.202272
2007	9094207838.272417
2008	11354587984.52931
2009	9486831534.50187
2010	9679354517.2259
2011	11251750870.819147
2012	12059061562.13246
2013	12076294233.46014
2014	11832039273.951393
2015	10647352234.2435
2016	10225596222.599577
2017	10678056190.56245
2018	10439012113.277395
2019	10848723685.711329
2020	10034469214.854975
2021	10204515812.240791