Year	current US$
2000	552.27423096
2001	597.93695068
2002	667.00244141
2003	1109.72570801
2004	1254.14208984
2005	1347.96057129
2006	1321.56274414
2007	1276.88183594
2008	1277.08239746
2009	1305.49035645
2010	1306.5255127
2011	1487.85217285
2012	1713.98034668
2013	2027.0144043
2014	2256.38867188
2015	2435.44506836
2016	2075.41918945
2017	1908.39660645
2018	1962.58374023
2019	2012.22570801
2020	1997.78820801
2021	1934.0802002