1989
| December 1989 | November 1989 | October 1989 | September 1989 |
| August 1989 | July 1989 | June 1989 | May 1989 |
| April 1989 | March 1989 | February 1989 | January 1989 |
1988
| December 1988 | November 1988 | October 1988 | September 1988 |
| August 1988 | July 1988 | June 1988 | May 1988 |
| April 1988 | March 1988 | February 1988 | January 1988 |
1987
| December 1987 | November 1987 | October 1987 | September 1987 |
| August 1987 | July 1987 | June 1987 | May 1987 |
| April 1987 | March 1987 | February 1987 | January 1987 |
1986
| December 1986 | November 1986 | October 1986 | September 1986 |
| August 1986 | July 1986 | June 1986 | May 1986 |
| April 1986 | March 1986 | February 1986 | January 1986 |
1985
| December 1985 | November 1985 | October 1985 | September 1985 |
| August 1985 | July 1985 | June 1985 | May 1985 |
| April 1985 | March 1985 | February 1985 | January 1985 |
1984
| December 1984 | November 1984 | October 1984 | September 1984 |
| August 1984 | July 1984 | June 1984 | May 1984 |
| April 1984 | March 1984 | February 1984 | January 1984 |
1983
| December 1983 | November 1983 | October 1983 | September 1983 |
| August 1983 | July 1983 | June 1983 | May 1983 |
| April 1983 | March 1983 | February 1983 | January 1983 |
1982
| December 1982 | November 1982 | October 1982 | September 1982 |
| August 1982 | July 1982 | June 1982 | May 1982 |
| April 1982 | March 1982 | February 1982 | January 1982 |
1981
| December 1981 | November 1981 | October 1981 | September 1981 |
| August 1981 | July 1981 | June 1981 | May 1981 |
| April 1981 | March 1981 | February 1981 | January 1981 |
1980
| December 1980 | November 1980 | October 1980 | September 1980 |
| August 1980 | July 1980 | June 1980 | May 1980 |
| April 1980 | March 1980 | February 1980 | January 1980 |