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ANNUAL SAMPLE DATA
| Year | CCCAAU | | 1948 | 32790 |
| 1949 | 34033 |
| 1950 | 35630 |
| 1951 | 34995 |
| 1952 | 30810 |
| 1953 | 32586 |
| 1954 | 33264 |
| 1955 | 34441 |
| 1956 | 34998 |
| 1957 | 35524 |
| 1958 | 35951 |
| 1959 | 36640 |
| 1960 | 37427 |
| 1961 | 38047 |
| 1962 | 38428 |
| 1963 | 38631 |
| 1964 | 39107 |
| 1965 | 39080 |
| 1966 | 39512 |
| 1967 | 40161 |
| 1968 | 40367 |
| 1969 | 40486 |
| 1970 | 40891 |
| 1971 | 40924 |
| 1972 | 40853 |
| 1973 | 41833 |
| 1974 | 41100 |
| 1975 | 41108 |
| 1976 | 41548 |
| 1977 | 41180 |
| 1978 | 41939 |
| 1979 | 42876 |
| 1980 | 42930 |
| 1981 | 42645 |
| 1982 | 42757 |
| 1983 | 43482 |
| 1984 | 42735 |
| 1985 | 43272 |
| 1986 | 44774 |
| 1987 | 45929 |
| 1988 | 46879 |
| 1989 | 47801 |
| 1990 | 47658 |
| 1991 | 47751 |
| 1992 | 48268 |
| 1993 | 49263 |
| 1994 | 49744 |
| 1995 | 49790 |
| 1996 | 51405 |
| 1997 | 52347 |
| 1998 | 52983 |
| 1999 | 54334 |
| 2000 | 56123 |
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