Year	%
1984	74.553
1985	60.86132
1986	44.42683
1987	61.4229
1988	73.36602
1989	67.34757
1990	65.97589
1991	83.12798
1992	78.70993
1993	76.37414
1999	77.67179
2000	76.42402
2002	71.30123
2003	88.24024
2004	86.42925
2005	89.0793
2006	83.98536
2008	63.14235
2009	81.68361
2011	59.23652
2012	60.54755
2013	73.84337