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ANNUAL SAMPLE DATA
| Year | AEIWAU | | 1948 | 2984 |
| 1949 | 3558 |
| 1950 | 3971 |
| 1951 | 3923 |
| 1952 | 3817 |
| 1953 | 4935 |
| 1954 | 5886 |
| 1955 | 6477 |
| 1956 | 5714 |
| 1957 | 6394 |
| 1958 | 7427 |
| 1959 | 8832 |
| 1960 | 9082 |
| 1961 | 8740 |
| 1962 | 9156 |
| 1963 | 10664 |
| 1964 | 11534 |
| 1965 | 11485 |
| 1966 | 11298 |
| 1967 | 12009 |
| 1968 | 12827 |
| 1969 | 12024 |
| 1970 | 13027 |
| 1971 | 15438 |
| 1972 | 18766 |
| 1973 | 19787 |
| 1974 | 17334 |
| 1975 | 17630 |
| 1976 | 18498 |
| 1977 | 17204 |
| 1978 | 19676 |
| 1979 | 22194 |
| 1980 | 21159 |
| 1981 | 21553 |
| 1982 | 22666 |
| 1983 | 26601 |
| 1984 | 26408 |
| 1985 | 27655 |
| 1986 | 30519 |
| 1987 | 33276 |
| 1988 | 38177 |
| 1989 | 40116 |
| 1990 | 38089 |
| 1991 | 34412 |
| 1992 | 34585 |
| 1993 | 36569 |
| 1994 | 39341 |
| 1995 | 40666 |
| 1996 | 44419 |
| 1997 | 48720 |
| 1998 | 52173 |
| 1999 | 56020 |
| 2000 | 59164 |
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