Year	constant 2015 US$
1990	2294.413767456083
1991	3101.231481894435
1992	4703.314856544067
1993	5345.67315437557
1994	5336.361642575765
1995	5486.357475620333
1996	5543.22546332756
1997	5251.200545373549
1998	5259.758809815732
1999	5223.314224001739
2000	5209.868944629729
2001	5400.3024335182145
2002	5463.775023159811
2003	5582.021165168847
2004	5811.895716621169
2005	5542.688949652827
2006	5626.957028395094
2007	5923.920575451665
2008	6383.542531973053
2009	7123.118997285802
2010	7679.956890605826
2011	7374.473861729222
2012	7880.172825472189
2013	7482.978820972188
2014	7090.216099395351
2015	7085.302697289089
2016	7266.7489337706875
2017	7438.394679771489
2018	7444.075055284337
2019	7478.560662756772
2020	6562.880647582391
2021	6785.351468388949
2022	7071.514766065105
2023	7263.218888234489