Year	constant 2015 US$
1991	2838.37624603688
1992	3492.634153670877
1993	3483.7955563412484
1994	3271.517589185252
1995	3369.0800832661357
1996	3890.390258453857
1997	4518.170644045847
1998	4586.908713088185
1999	4518.193478943725
2000	4309.043284628055
2001	4436.554827571645
2002	4467.267449989878
2003	4894.250018757573
2004	4460.904217805439
2005	4597.784455060038
2006	4945.977630757886
2007	4571.165103166918
2008	4724.846292151008
2009	4465.389979699348
2010	4631.545396748125
2011	4689.847182934481
2012	4218.235116366188
2013	4245.523083803693
2014	4332.629374192195
2015	4266.904872272623
2016	4326.981283651474
2017	4278.756019368836
2018	4091.8654405603397
2019	3946.2043748694873
2020	3823.744391190732
2021	3686.8646395512797
2022	3580.1850681694914