Year	current US$
1987	1265.37268066406
1988	1452.65246582031
1989	1559.33752441406
1990	1532.50463867188
1991	1474.34484863281
1992	1417.17077636719
1993	1258.12951660156
1994	1012.09869384766
1995	935.958740234375
1996	872.713500976563
1997	991.242797851563
1998	835.236633300781
1999	635.757934570313
2000	658.344604492188
2001	807.801940917969
2002	911.906860351563
2003	1087.7880859375
2004	1416.60375976563
2005	1894.46008300781
2006	2391.32397460938
2007	3197.93432617188
2008	4066.53173828125
2009	2639.37817382813
2010	3078.41479492188
2011	3704.84228515625
2012	4004.78979492188
2013	4187.73974609375
2014	3104.65380859375
2015	2124.66259765625
2016	2187.7275390625
2017	2638.32543945313
2018	3096.5625
2019	3661.45776367188
2020	3751.7373046875
2021	4827.845703125
2022	4575.97509765625
2023	5181.36279296875