Year	current US$
2000	21.53066543466273
2001	23.28811290955535
2002	25.618967248855032
2003	28.272565490033223
2004	30.9890879385236
2005	35.541082045261874
2006	39.20455994923402
2007	43.36490875576401
2008	53.39099801980637
2009	59.27880481621662
2010	66.51015139755636
2011	81.90289450677369
2012	93.20262786440586
2013	102.32431448558012
2014	106.20124557720091
2015	109.36102476022306
2016	112.96293737705383
2017	124.04476986556931
2018	139.4681798343488
2019	146.7286417013022
2020	155.14739119443917
2021	174.83484400377998