Year	US Dollars
1989	0.00223
1990	0.00223
1991	0.00222
1992	3.66955
1993	17.81393
1994	108.59494
1995	257.51047
1996	217.9796
1997	212.97027
1998	222.34674
1999	309.71241
2000	176.56573
2001	152.58412
2002	132.37869
2003	129.52951
2004	165.60782
2005	131.86391
2006	132.28897
2007	149.48067
2008	117.92133
2009	107.62427
2010	134.12967
2011	167.18041
2012	154.5896
2013	144.07782
2014	176.47382
2015	101.12294
2016	128.15909
2017	128.06295
2018	104.7225
2019	137.03052
2020	132.11158
2021	174.19136