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ANNUAL SAMPLE DATA
| Year | CEGNAU | | 1963 | 2495 |
| 1964 | 2699 |
| 1965 | 2821 |
| 1966 | 2979 |
| 1967 | 3378 |
| 1968 | 3620 |
| 1969 | 3746 |
| 1970 | 4087 |
| 1971 | 4544 |
| 1972 | 4910 |
| 1973 | 5233 |
| 1974 | 5384 |
| 1975 | 5574 |
| 1976 | 5059 |
| 1977 | 5189 |
| 1978 | 5356 |
| 1979 | 5682 |
| 1980 | 5888 |
| 1981 | 6154 |
| 1982 | 6709 |
| 1983 | 7585 |
| 1984 | 8336 |
| 1985 | 9019 |
| 1986 | 10761 |
| 1987 | 12348 |
| 1988 | 14041 |
| 1989 | 15217 |
| 1990 | 16000 |
| 1991 | 15813 |
| 1992 | 15513 |
| 1993 | 16429 |
| 1994 | 15903 |
| 1995 | 16053 |
| 1996 | 17246 |
| 1997 | 18729 |
| 1998 | 19334 |
| 1999 | 20109 |
| 2000 | 21230 |
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