Year	US Dollars
1991	4.58044
1992	128.19142
1993	585.96625
1994	943.18478
1995	666.64857
1996	1017.19549
1997	759.81034
1998	661.00569
1999	922.36794
2000	872.62444
2001	1209.49007
2002	988.73137
2003	1004.159
2004	766.07623
2005	944.83504
2006	963.18254
2007	1019.88459
2008	838.33159
2009	1120.90707
2010	592.7241
2011	1210.89658
2012	1323.63806
2013	1318.58324
2014	1073.24995
2015	743.5457
2016	462.4062
2017	888.79835
2018	890.56965
2019	830.85681
2020	1530.96181
2021	1155.82815