Year	current US$
2000	399.36923392
2001	272.57977154
2002	207.06821873
2003	199.30882558
2004	149.62552534
2005	287.92435633
2006	310.20370925
2007	397.54679833
2008	433.41107554
2009	289.03951088
2010	367.21867073
2011	375.62489801
2012	390.90013648
2013	444.43341996
2014	548.89023116
2015	577.90988484
2016	859.74809635
2017	801.868555
2018	1035.53488493
2019	1037.50713854
2020	1026.94989803
2021	1327.95399893