Year	current US$
1986	5581.568752046737
1987	6629.750303764345
1988	8127.442822326898
1989	9561.965477972553
1990	10405.61816456174
1991	11505.079190565955
1992	12204.472586676944
1993	13280.676999935005
1994	14813.775974743543
1995	15093.329864141206
1996	15252.134766403415
1997	16321.167909620197
1998	17483.803058950627
1999	17329.374327702004
2000	18604.83443916735
2001	18128.18246753603
2002	17676.121217246488
2003	19169.394428912958
2004	20771.109415231025
2005	17354.655943640868
2006	22021.670315181684
2007	20791.855272045108
2008	24816.242379671414
2009	22257.058757249426
2010	20513.792952012936
2011	20830.501780529874
2012	21813.971803901502
2013	22115.614213346522
2014	23111.23222438558
2015	24093.582638891297
2016	24018.878424644143
2017	24457.6022653116
2018	24859.52543525075
2019	26702.132156649535
2020	20971.438087209834
2021	24994.772987977038