Year	constant 2015 US$
1990	9756.073207625543
1991	7843.697492657324
1992	7096.262869033326
1993	6491.782234962814
1994	6796.704666797188
1995	7306.30706518157
1996	7855.139990852077
1997	8380.537174538877
1998	8574.111379057103
1999	8537.533101409013
2000	8877.06198270207
2001	9513.186676894471
2002	10060.984328830433
2003	10621.33826761932
2004	11062.217478791039
2005	11523.877156741535
2006	12106.077370556817
2007	12723.243503064217
2008	12981.734245899119
2009	12057.743816670041
2010	11937.098030153995
2011	11971.40675072447
2012	11732.078341994806
2013	11728.69988992477
2014	11736.334882445362
2015	12135.103618668334
2016	12666.087207666185
2017	13250.410717187842
2018	13768.18944712996
2019	14321.334478847375
2020	13157.972425573666
2021	15520.797493434915
2022	16712.036051969386
2023	17234.481086831565