Year	%
1976	32.61628
1977	25.00969
1978	26.85711
1979	47.51774
1980	41.25557
1981	40.74534
1982	44.57484
1983	57.35504
1984	56.5465
1985	58.78307
1986	51.70856
1987	55.13794
1989	70.02332
1990	71.24664
1992	81.04225
1993	79.66464
1994	81.45418
1995	80.64068
1996	83.62935
1998	88.12774
1999	89.84765
2000	91.31489
2001	95.49355
2002	94.81167
2003	94.33882
2004	94.71906
2007	93.70669
2008	93.81158
2009	100
2012	90.75719
2013	97.86967
2014	86.36727
2016	97.87403