Year	Percent
1973	76.90539
1976	80.25003
1977	82.03024
1978	86.62651
1979	72.04391
1980	74.42049
1981	98.46845
1982	74.53058
1983	73.51696
1984	76.71175
1985	76.27243
1986	78.88213
1987	80.21735
1988	78.73472
1989	83.56638
1990	87.30876
1991	80.6163
1993	77.68675
1994	83.58273
1995	93.22419
1996	89.15781
1997	91.3097
1999	88.54347
2000	87.81459
2001	88.5551
2002	93.87601
2003	97.50902
2004	100.56651
2005	103.16063
2007	103.85343
2008	92.8179
2009	87.71348
2010	99.25079
2013	96.41343
2014	99.08238
2015	102.74186