Year	constant 2015 US$
1995	15287.35608309241
1996	15389.54989455811
1997	14733.11456904554
1998	14458.08277968463
1999	15006.494187730135
2000	16127.9690335679
2001	15930.914824423753
2002	17428.1476432953
2003	17442.092220433085
2004	17832.733635258337
2005	19599.157117690203
2006	20066.390681447247
2007	22590.253339461826
2008	22864.60637225649
2009	21541.577808898084
2010	20625.90416120061
2011	21029.39947919843
2012	24986.696158822386
2013	24747.622698555206
2014	24815.952651901192
2015	23987.52075237044
2016	24541.30896510405
2017	26003.240367700586
2018	27030.737760155433
2019	28124.24740094607
2020	27423.892460824125
2021	32706.847925230977
2022	34710.19186769871