Year	constant 2021 international $
1997	5006.870923342912
1998	5515.14923769073
1999	6231.203420582148
2000	6754.124612176666
2001	7400.175731855051
2002	7706.642493138026
2003	8175.472684587503
2004	8637.705394660023
2005	9129.18211713778
2006	9815.717480272815
2007	10467.129573391232
2008	11094.049482627119
2009	11306.359110404017
2010	11851.97417713203
2011	12312.540011357414
2012	12412.337327526078
2013	12865.254938071632
2014	13019.671443507585
2015	13381.196802182543
2016	13902.719366672613
2017	14256.361072820897
2018	14813.775900263601
2019	15013.374196780986
2020	14553.635588603946
2021	16035.435756617795