Year	current US$
2000	145.51017011
2001	160.58202721
2002	165.64705078
2003	171.86465389
2004	194.71793593
2005	205.13186629
2006	221.01515155
2007	245.59918957
2008	264.79069291
2009	231.85561648
2010	270.81238963
2011	301.36784284
2012	312.03181574
2013	339.28454115
2014	320.35615835
2015	291.36755483
2016	252.74439283
2017	260.20140364
2018	263.35165641
2019	271.74970981
2020	284.78014217
2021	305.91035084