Year	current US$
2000	46.52263736
2001	45.38647545
2002	44.05678032
2003	48.34755542
2004	53.98337656
2005	56.4484251
2006	64.85657785
2007	73.89229666
2008	97.85056351
2009	94.94595363
2010	96.52170044
2011	98.22588367
2012	97.16981163
2013	73.51942069
2014	72.99194377
2015	74.90653009
2016	72.2869082
2017	76.02548953
2018	86.75491432
2019	90.67849817
2020	93.02998767
2021	109.21465305