Year	%
1973	55.21542
1975	60.56266
1976	69.94697
1977	63.9576
1978	79.04055
1979	69.95192
1980	70.54161
1981	65.61503
1982	68.85246
1983	67.31583
1984	69.62604
1985	60.66532
1986	52.9327
1998	85.64676
1999	70.87846
2000	73.68687
2001	72.89152
2002	91.11979
2003	89.58806
2004	85.78546
2005	94.0667
2006	97.37673
2007	85.46966
2010	85.84154
2011	92.85269
2012	92.71281
2013	93.89279