Year	%
1984	55.41499
1985	50.17661
1986	38.73506
1987	48.90388
1988	76.428
1989	58.94233
1990	74.05417
1991	72.88395
1992	78.60726
1993	76.39923
1999	77.8113
2000	78.27981
2002	69.00886
2003	75.27956
2004	77.62088
2005	82.79815
2006	75.48155
2008	52.71885
2009	70.01601
2011	46.59465
2012	47.42421
2013	62.43597