| 年度 | 数值 | 单位 | 发布日期 |
| 1992 | 17 | 千头 | 2026-9 |
| 1991 | 18 | 千头 | 2026-9 |
| 1990 | 18 | 千头 | 2026-9 |
| 1989 | 19 | 千头 | 2026-9 |
| 1988 | 27 | 千头 | 2026-9 |
| 1987 | 42 | 千头 | 2026-9 |
| 1986 | 38 | 千头 | 2026-9 |
| 1985 | 57 | 千头 | 2026-9 |
| 1984 | 54 | 千头 | 2026-9 |
| 1983 | 38 | 千头 | 2026-9 |
| 1982 | 45 | 千头 | 2026-9 |
| 1981 | 32 | 千头 | 2026-9 |
| 1980 | 31 | 千头 | 2026-9 |
| 1979 | 31 | 千头 | 2026-9 |
| 1978 | 33 | 千头 | 2026-9 |
| 1977 | 36 | 千头 | 2026-9 |
| 1976 | 49 | 千头 | 2026-9 |
| 1975 | 87 | 千头 | 2026-9 |
| 1974 | 96 | 千头 | 2026-9 |
| 1973 | 111 | 千头 | 2026-9 |
| 1972 | 122 | 千头 | 2026-9 |
| 1971 | 131 | 千头 | 2026-9 |
| 1970 | 137 | 千头 | 2026-9 |
| 1969 | 131 | 千头 | 2026-9 |
| 1968 | 141 | 千头 | 2026-9 |
| 1967 | 165 | 千头 | 2026-9 |
| 1966 | 178 | 千头 | 2026-9 |
| 1965 | 193 | 千头 | 2026-9 |
| 1964 | 218 | 千头 | 2026-9 |
| 1963 | 236 | 千头 | 2026-9 |
| 1962 | 258 | 千头 | 2026-9 |
| 1961 | 245 | 千头 | 2026-9 |
| 1960 | 250 | 千头 | 2026-9 |