Year	current US$
2000	374.19249675
2001	395.22054183
2002	401.35308528
2003	426.73251944
2004	425.36260095
2005	448.99368228
2006	477.77738204
2007	534.43882992
2008	604.79748186
2009	636.59026864
2010	640.82675791
2011	632.78336933
2012	649.17876363
2013	699.1584821
2014	715.15444308
2015	691.3762316
2016	823.84437536
2017	1145.0864893
2018	941.81972491
2019	983.14480498
2020	1106.50851088
2021	1093.88545999