Year	current US$
2000	21.5297915207765
2001	23.28728490594478
2002	25.618122743439628
2003	28.27172975202047
2004	30.988236168266262
2005	35.54015676055571
2006	39.2035459314017
2007	43.36386945248374
2008	53.39002757397195
2009	59.27780621937441
2010	66.50922676958184
2011	81.90218902153542
2012	93.20207888485122
2013	102.3237490985917
2014	106.20066150477012
2015	109.36017892575279
2016	112.96194583871836
2017	124.04388776475673
2018	139.46755949124974
2019	146.72825935997818
2020	155.14692924708484
2021	174.8346943182343