Year	current US$
2000	75.74879456
2001	121.89750671
2002	130.00967407
2003	204.33622742
2004	311.54873657
2005	335.87945557
2006	363.31265259
2007	273.25195313
2008	247.2456665
2009	187.76727295
2010	214.1880188
2011	267.01419067
2012	307.66137695
2013	363.10922241
2014	422.53189087
2015	390.99450684
2016	408.19976807
2017	461.36679077
2018	457.06945801
2019	488.62384033
2020	483.79559326
2021	565.25927734