Year	Percent
1980	87.1335
1981	89.32269
1982	110.56445
1983	121.04489
1984	64.83808
1985	59.76961
1986	49.32979
1987	79.28138
1988	77.10078
1989	83.36174
1990	100.42354
1991	97.0269
1992	89.20379
1993	75.61274
1994	83.5749
1995	88.47613
1996	84.8035
1997	86.31043
1998	83.24995
1999	83.75029
2000	79.71494
2001	57.80415
2002	58.3837
2003	59.19281
2004	67.06857
2005	77.91768
2006	73.11609
2007	70.87892
2008	75.66759
2009	48.24685
2010	49.77868
2011	65.30174
2012	64.74659
2013	62.65229
2014	62.02818
2015	53.3132
2016	56.3988
2017	58.55887