Year	current US$
2001	1653.06770273
2002	1656.71049633
2003	1860.42829482
2004	2209.33906482
2005	2311.60041939
2006	2471.44314401
2007	2936.80848973
2008	3401.4214426
2009	3323.10241662
2010	3187.67592125
2011	3998.06699607
2012	3860.11071842
2013	3700.3227516
2014	3663.07400522
2015	3079.95465163
2016	3204.16272833
2017	3247.81402084
2018	3566.75368586
2019	3421.63382676
2020	3448.67791477
2021	3642.06768179