Year	Number
1970	3.15625
1971	1.82609
1972	5.36842
1973	9.25
1974	6.96296
1975	7.73913
1976	12.62069
1979	6.24324
1980	4.51546
1981	5.84722
1982	11
1983	10.74074
1984	11.18644
1985	12.07937