Year	current US$
2000	349.9498291
2001	268.19760132
2002	217.82833862
2003	289.56884766
2004	230.17105103
2005	244.12539673
2006	294.79556274
2007	294.89035034
2008	314.00231934
2009	330.92410278
2010	476.28549194
2011	516.60144043
2012	492.8399353
2013	507.15719604
2014	522.53997803
2015	457.81326294
2016	714.24078369
2017	1014.10552979
2018	820.4006958
2019	1109.26647949
2020	879.4911499
2021	1070.95751953