Year	Percent
1965	88.9755
1966	88.30343
1967	85.53808
1968	95.58847
1969	99.19849
1970	117.60913
1971	104.92359
1972	78.87051
1973	76.34223
1974	88.01378
1975	82.53251
1976	73.02923
1977	72.46751
1978	60.75596
1979	69.61254
1980	73.91388
1981	77.21858
1982	69.97416
1983	55.71518
1984	65.07383
1985	72.41258
1986	54.02649
1987	57.1865
1988	51.5261
1989	65.94746
1990	52.66258
1991	49.25047
1992	45.35248
1993	39.63961
1994	40.87237
1995	41.9464
1996	42.41789
1997	44.72139
1998	41.37639
1999	48.21721
2000	56.96504