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ANNUAL SAMPLE DATA
| Year | BCGTAU | | 1955 | 500.9 |
| 1956 | 399.7 |
| 1957 | 423 |
| 1958 | 555.3 |
| 1959 | 647.7 |
| 1960 | 804.9 |
| 1961 | 742.7 |
| 1962 | 784.7 |
| 1963 | 1008.5 |
| 1964 | 1190.7 |
| 1965 | 1122.5 |
| 1966 | 1065.4 |
| 1967 | 1116.6 |
| 1968 | 1416.8 |
| 1969 | 987.4 |
| 1970 | 1097.1 |
| 1971 | 1301.8 |
| 1972 | 2130.5 |
| 1973 | 1648.2 |
| 1974 | 1233.9 |
| 1975 | 1182.6 |
| 1976 | 1278.5 |
| 1977 | 1313.4 |
| 1978 | 1579.4 |
| 1979 | 1705.1 |
| 1980 | 1519.2 |
| 1981 | 1494.6 |
| 1982 | 1584.5 |
| 1983 | 1806.1 |
| 1984 | 1759.1 |
| 1985 | 1841.8 |
| 1986 | 1883 |
| 1987 | 2016.3 |
| 1988 | 2210.4 |
| 1989 | 2304.7 |
| 1990 | 2005 |
| 1991 | 1600.3 |
| 1992 | 1599.1 |
| 1993 | 1776.5 |
| 1994 | 1906.3 |
| 1995 | 1938.2 |
| 1996 | 2018.4 |
| 1997 | 2157 |
| 1998 | 2261.6 |
| 1999 | 2241.7 |
| 2000 | 2337.3 |
| 2001 | 2577.5 |
| 2002 | 2682.2 |
| 2003 | 2646.1 |
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