Year	current US$
2000	616.37762451
2001	635.96447754
2002	683.33959961
2003	802.85565186
2004	938.14080811
2005	960.32305908
2006	1026.78039551
2007	1042.89624023
2008	1136.86572266
2009	1165.37597656
2010	1116.53308105
2011	1166.02197266
2012	1298.25585938
2013	1249.76574707
2014	1179.06518555
2015	1158.39306641
2016	1185.16308594
2017	1186.16967773
2018	1173.62854004
2019	1172.40539551
2020	1238.5871582
2021	1400.43579102