Year	constant 2015 US$
1995	16719.308365029807
1996	17012.545284327836
1997	17438.386772165144
1998	17958.427793371193
1999	18497.695561349967
2000	19115.636230735672
2001	19526.426816803352
2002	19763.695680895686
2003	20053.25233934155
2004	20565.262573295146
2005	20978.83324225304
2006	21549.02023388254
2007	22059.730032584914
2008	21903.3892163872
2009	21203.380333740537
2010	21619.256111055885
2011	21819.17488736462
2012	21690.469473533285
2013	21747.99528381664
2014	22067.2859537652
2015	22452.292724846335
2016	22746.177145128077
2017	23243.345104106527
2018	23617.684754405072
2019	24008.578535371325
2020	22488.70242795645
2021	23865.793657722326
2022	24309.339328380658