Year	constant 2015 US$
1995	3889.7192318086886
1996	3777.5890511886328
1997	3798.136120982
1998	3468.4383924728986
1999	3457.6947691950545
2000	3493.8079830686065
2001	3561.919488277673
2002	3993.8743838853047
2003	3893.2817437894396
2004	4288.231311089246
2005	4447.789633577099
2006	4761.700775552425
2007	5370.492155844842
2008	5396.833127904614
2009	5636.939104970168
2010	5992.349591584591
2011	6115.277118316011
2012	6468.705767876665
2013	6724.167106004673
2014	7034.390585338936
2015	7418.341489994214
2016	7776.360680407857
2017	8125.652446731319
2018	8309.451269359653
2019	8503.606413699497
2020	8341.746628846637
2021	8715.530935991637