Year	current US$
2000	29.95455326
2001	28.45478406
2002	27.05022608
2003	29.8580905
2004	33.28274087
2005	33.71959598
2006	38.54797469
2007	44.154363
2008	57.5516659
2009	58.36592777
2010	58.11081659
2011	58.57382533
2012	57.66985009
2013	41.15027978
2014	41.23282641
2015	40.59802417
2016	39.66415412
2017	41.79191641
2018	41.53529513
2019	43.41379755
2020	44.53960207
2021	52.2882675