Year	current US$
2000	44.38974787
2001	44.91276829
2002	41.82261532
2003	33.74943409
2004	33.30920469
2005	39.39049435
2006	41.10211333
2007	45.32325474
2008	57.08178945
2009	61.17301982
2010	67.27443405
2011	71.80534288
2012	86.91772198
2013	82.61416611
2014	87.2052136
2015	103.16476983
2016	85.70940786
2017	60.9036152
2018	75.27230052
2019	90.8283265
2020	89.50800067
2021	98.64854827