Year	current US$
2000	30.52850722
2001	36.08511234
2002	41.50363404
2003	46.06757857
2004	51.79965467
2005	64.0684778
2006	82.42012248
2007	97.57017437
2008	110.30471614
2009	133.56567852
2010	141.11463963
2011	173.0602373
2012	176.15992713
2013	157.16829151
2014	189.03353761
2015	188.16236134
2016	200.8948187
2017	215.03938704
2018	212.50401624
2019	168.30293771
2020	173.93400206
2021	216.82850236