Year	constant 2015 US$
1991	26252.7162059934
1992	27165.683953069005
1993	27535.313769067954
1994	26455.988993591138
1995	26173.016174386114
1996	25363.610924786128
1997	25525.04068017662
1998	25221.301213060386
1999	24749.620964581376
2000	24404.11687813152
2001	23820.601956416023
2002	23463.83913126722
2003	23166.043307229273
2004	23579.914439357693
2005	23146.621786143303
2006	22598.765079994602
2007	22075.381758738124
2008	21384.92000925966
2009	21122.80408820092
2010	22183.273024545462
2011	22609.425183745057
2012	22599.248732409524
2013	23161.242884054027
2014	24220.26870459109
2015	24678.498753299587
2016	32535.28606884807
2017	39852.61718828061
2018	50020.74605165315
2019	41982.55935835064
2020	44612.45286005501
2021	52618.91027230914
2022	49190.49129689567