1979
| December 1979 | November 1979 | October 1979 | September 1979 |
| August 1979 | July 1979 | June 1979 | May 1979 |
| April 1979 | March 1979 | February 1979 | January 1979 |
1978
| December 1978 | November 1978 | October 1978 | September 1978 |
| August 1978 | July 1978 | June 1978 | May 1978 |
| April 1978 | March 1978 | February 1978 | January 1978 |
1977
| December 1977 | November 1977 | October 1977 | September 1977 |
| August 1977 | July 1977 | June 1977 | May 1977 |
| April 1977 | March 1977 | February 1977 | January 1977 |
1976
| December 1976 | November 1976 | October 1976 | September 1976 |
| August 1976 | July 1976 | June 1976 | May 1976 |
| April 1976 | March 1976 | February 1976 | January 1976 |
1975
| December 1975 | November 1975 | October 1975 | September 1975 |
| August 1975 | July 1975 | June 1975 | May 1975 |
| April 1975 | March 1975 | February 1975 | January 1975 |
1974
| December 1974 | November 1974 | October 1974 | September 1974 |
| August 1974 | July 1974 | June 1974 | May 1974 |
| April 1974 | March 1974 | February 1974 | January 1974 |
1973
| December 1973 | November 1973 | October 1973 | September 1973 |
| August 1973 | July 1973 | June 1973 | May 1973 |
| April 1973 | March 1973 | February 1973 | January 1973 |
1972
| December 1972 | November 1972 | October 1972 | September 1972 |
| August 1972 | July 1972 | June 1972 | May 1972 |
| April 1972 | March 1972 | February 1972 | January 1972 |
1971
| December 1971 | November 1971 | October 1971 | September 1971 |
| August 1971 | July 1971 | June 1971 | May 1971 |
| April 1971 | March 1971 | February 1971 | January 1971 |
1970