Year	current US$
2000	217.02324452
2001	233.28976742
2002	231.11091722
2003	245.42082897
2004	249.89540821
2005	282.68686613
2006	310.85306794
2007	345.28534103
2008	339.02521027
2009	273.5793733
2010	299.58920466
2011	307.00740962
2012	327.76096108
2013	321.28340156
2014	335.86673427
2015	315.52425133
2016	358.61420884
2017	344.15467355
2018	338.47628949
2019	332.75100872
2020	329.09507883
2021	302.65336974