Year	Percent
1976	73.69442
1977	86.73542
1978	78.2128
1979	82.63876
1985	96.16797
1987	91.84539
1988	89.02628
1989	98.24887
2005	79.41884
2006	88.12512
2007	74.88502
2008	89.88561
2009	90.92925
2010	93.38876
2011	93.97836
2012	95.27818
2013	96.46694
2014	101.33084
2015	100.89958
2016	100.88272