Year	Percent
1971	42.82279
1972	77.03163
1973	68.18632
1974	83.76061
1975	102.77098
1976	96.73055
1977	99.94631
1978	97.82539
1979	92.37562
1980	85.32679
1981	87.37724
1983	93.5658