Year	current US$
1999	42004.94840081472
2000	37473.78698296109
2001	39415.162943216514
2002	41770.146618371444
2003	51198.42525839663
2004	59249.64768157289
2005	60520.792036111125
2006	63692.616768195665
2007	71970.05872504423
2008	77962.14398758713
2009	66200.67297278174
2010	59516.32339882231
2011	55815.285261145385
2012	48433.57029956848
2013	50435.36732982111
2014	50133.60652433586
2015	42281.81125492635
2016	43398.42852572271
2017	44885.51783777304
2018	48464.524647791884
2019	47287.39839486335
2020	45321.48922261609
2021	54982.45171481698