Year	%
1973	90.24127
1974	97.93039
1975	91.27962
1976	97.01646
1977	94.08898
1979	94.3534
1982	97.75595
1983	97.32213
1984	95.05362
1985	97.26659
1986	96.80363
1987	98.78569
1988	99.49373
1989	98.79721
1990	98.26561
1991	94.02025
1992	96.95369
1993	99.48798
1994	98.72636
1996	98.03728
1999	98.70699
2000	99.94577
2001	98.98802
2002	97.74784
2003	98.47823
2004	99.22658
2005	99.87523
2006	99.63031
2009	97.66702
2010	95.76771
2011	99.42204
2012	98.39354
2013	99.93103