Year	%
1987	87.046
1988	74.70751
1989	82.13901
1990	66.07042
1994	69.37145
1995	76.10372
1998	72.47026
1999	68.41344
2000	77.90648
2001	80.37706
2002	86.13873
2003	69.84987
2004	71.2071
2005	73.36927
2009	96.46363
2010	100
2011	91.81709
2012	100
2015	79.66074