| Periodical Volume Date: 1968 | Periodical Volume Number: 1 | (1/206) |
| Periodical Volume Date: 1969 | Periodical Volume Number: 2 | (1/208) |
| Periodical Volume Date: 1970 | Periodical Volume Number: 3 | (1/212) |
| Periodical Volume Date: 1971 | Periodical Volume Number: 4 | (1/216) |
| Periodical Volume Date: 1972 | Periodical Volume Number: 5 | (1/212) |
| Periodical Volume Date: 1973 | Periodical Volume Number: 6 | (1/216) |
| Periodical Volume Date: 1974 | Periodical Volume Number: 7 | (1/216) |
| Periodical Volume Date: 1975 | Periodical Volume Number: 8 | (1/216) |
| Periodical Volume Date: 1976 | Periodical Volume Number: 9 | (1/216) |
| Periodical Volume Date: 1977 | Periodical Volume Number: 10 | (1/216) |
| Periodical Volume Date: 1978 | Periodical Volume Number: 11 | (1/220) |
| Periodical Volume Date: 1979 | Periodical Volume Number: 12 | (1/216) |
| Periodical Volume Date: 1980 | Periodical Volume Number: 13 | (1/208) |
| Periodical Volume Date: 1981 | Periodical Volume Number: 14 | (1/216) |
| Periodical Volume Date: 1982 | Periodical Volume Number: 15 | (1/212) |
| Periodical Volume Date: 1983 | Periodical Volume Number: 16 | (1/212) |
| Periodical Volume Date: 1984 | Periodical Volume Number: 17 | (1/220) |
| Periodical Volume Date: 1985 | Periodical Volume Number: 18 | (1/188) |
| Periodical Volume Date: 1986 | Periodical Volume Number: 19 | (1/216) |
| Periodical Volume Date: 1987 | Periodical Volume Number: 20 | (1/204) |
| Periodical Volume Date: 1988 | Periodical Volume Number: 21 | (1/220) |
| Periodical Volume Date: 1989 | Periodical Volume Number: 22 | (1/216) |
| Periodical Volume Date: 1990 | Periodical Volume Number: 23 | (1/216) |
