| Anno | Numero di iscritti |
| 1944 | 900 |
| 1945 | 10627 |
| 1946 | 10000 |
| 1947 | 15585 |
| 1948 | 14498 |
| 1949 | 9364 |
| 1950 | 9632 |
| 1951 | 8260 |
| 1952 | 9320 |
| 1953 | 9737 |
| 1954 | 10484 |
| 1955 | 9045 |
| 1956 | 8132 |
| 1957 | 6779 |
| 1958 | 7043 |
| 1959 | 6870 |
| 1960 | 6896 |
| 1961 | 6921 |
| 1962 | 6824 |
| 1963 | 6743 |
| 1964 | 6748 |
| 1965 | 6515 |
| 1966 | 1340 |
| 1967 | 6088 |
| 1968 | 6097 |
| 1969 | 6113 |
| 1970 | 6145 |
| 1971 | 6145 |
| 1972 | 6213 |
| 1973 | 6214 |
| 1974 | 6303 |
| 1975 | 7113 |
| 1976 | 7807 |
| 1977 | 7631 |
| 1978 | 7642 |
| 1979 | 7315 |
| 1980 | 7111 |
| 1981 | 6814 |
| 1982 | 6326 |
| 1983 | 6112 |
| 1984 | 6034 |
| 1985 | 5819 |
| 1986 | 5608 |
| 1987 | 5283 |
| 1988 | 5052 |
| 1989 | 4875 |
| 1990 | 4234 |