- 1970 to 1970 43,280
- 1971 to 1971 43,589
- 1972 to 1972 45,514
- 1973 to 1973 45,493
- 1974 to 1974 46,829
- 1975 to 1975 48,878
- 1976 to 1976 50,436
- 1977 to 1977 52,857
- 1978 to 1978 53,410
- 1979 to 1979 53,423
- 1980 to 1980 57,087
- 1981 to 1981 54,423
- 1982 to 1982 56,522
- 1983 to 1983 60,728