Year	constant 2021 international $
1999	20814.61993218368
2000	21657.628052806915
2001	22714.858323402703
2002	24147.08336747965
2003	25224.450603690835
2004	26443.140447413018
2005	27299.46218668538
2006	28162.566780956335
2007	27960.90220135286
2008	28389.870525044556
2009	27325.767388461838
2010	27578.93919896151
2011	27833.96211521104
2012	27581.45376509115
2013	28618.090561570243
2014	29527.331772179652
2015	30723.366573120104
2016	32285.917971322127
2017	33095.99758689393
2018	34652.60199530012
2019	36892.28341230228
2020	35967.77182326164
2021	37419.47569016191
2022	37600.15000351311