Year	current US$
1995	3154.6268213790604
1996	3556.055326290882
1997	3588.4954046572443
1998	3940.0233811848066
1999	4009.08900538256
2000	3834.726854142728
2001	4168.8962898307955
2002	4841.705471336726
2003	6144.111552525545
2004	7850.255344528264
2005	8920.300743868875
2006	10211.908915151793
2007	12715.450666747967
2008	15012.361677663434
2009	13282.129209069739
2010	13479.61710008302
2011	14577.732431026101
2012	14119.209770860047
2013	14882.058561095711
2014	15227.836609284583
2015	13194.827095876823
2016	13276.437402718826
2017	14248.591605647214
2018	15891.483956288268
2019	15653.308224124341
2020	15875.115630502542
2021	17386.339380148285