Year	current US$
2000	7.11643408
2001	7.41441667
2002	7.38167737
2003	8.39385677
2004	10.82246342
2005	13.16633544
2006	15.91677476
2007	18.61119334
2008	22.16902368
2009	24.17851274
2010	29.61303142
2011	33.70988542
2012	44.67358184
2013	43.44268753
2014	49.24488036
2015	51.51603376
2016	55.60192028
2017	63.58743235
2018	73.21827915
2019	78.34597556
2020	65.88110033
2021	69.04072352