Year	US Dollars
1992	0.0704
1993	0.36369
1994	1.26246
1995	3.67435
1996	3.77567
1997	5.91034
1998	6.57104
1999	6.42696
2000	7.51469
2001	5.99372
2002	7.25788
2003	7.5134
2004	9.40097
2005	6.46119
2006	5.64816
2007	6.24088
2008	6.57222
2009	6.16586
2010	6.93709
2011	4.90058
2012	8.59494
2013	9.75955
2014	10.55573
2015	14.40945
2016	16.04658
2017	19.73349
2018	32.10574
2019	34.32752
2020	42.78301
2021	32.66409