Year	constant 2015 US$
2002	20827.805804867057
2003	21610.365477537798
2004	21739.046140281225
2005	19767.453601571677
2006	19235.40582941128
2007	18806.622930334273
2008	17565.581184984174
2009	15233.943472866638
2010	16294.510919836785
2011	15541.554155415542
2012	15715.743349960961
2013	16204.545599839132
2014	16974.278421362655
2015	17665.100749310866
2016	22995.527409506638
2017	28549.32657609627
2018	23242.925437581926
2019	20796.030423372074
2020	14703.511611975526