Year	constant 2015 US$
1986	16111.84319888957
1987	18732.26382812656
1988	22266.344824159274
1989	24865.17742009494
1990	25411.168107232905
1991	26564.661652851893
1992	27194.41454832271
1993	28307.377172930504
1994	29666.230917873545
1995	29497.963535780837
1996	28958.14380084946
1997	30074.406242133948
1998	29765.515165603763
1999	29262.615877009197
2000	30703.66119107966
2001	31426.878742212553
2002	30760.207554316767
2003	30793.134964814933
2004	32742.760746910037
2005	32291.76953712117
2006	32272.25118920537
2007	32863.36278352161
2008	33053.76758562883
2009	28836.01747661052
2010	27732.213905292854
2011	28398.55757746979
2012	27876.206396202615
2013	29447.579999455935
2014	28780.630857446587
2015	28419.2645344661
2016	28737.896485192603
2017	30598.649022853482
2018	31172.80251297252
2019	30317.60738754844
2020	23015.742045076717
2021	29390.380953037344
2022	32492.178877521364