- 1927 to 1929 517
- 1930 to 1934 515
- 1935 to 1939 517
- 1940 to 1944 515
- 1945 to 1949 515
- 1950 to 1954 515
- 1955 to 1959 515
- 1960 to 1964 515
- 1965 to 1969 520
- 1970 to 1974 523
- 1975 to 1979 546
- 1980 to 1984 658
- 1985 to 1989 1,010
- 1990 to 1994 1,312
- 1995 to 1999 622
- 2000 to 2000 517