1980
1981
1982
1983 ?, Jun?,
1984 Jan, Feb, Mar, Aug?, Sep, Nov, Nov, Dec.
1985 Apr?, May, June, Jul, Oct, Dec.
1986 Feb, May, May, Jun,
1987 Mar?, Apr, Apr, May, Jun, Jun, Aug, Sep, Dec.
1988 May, Summer, Sep, Nov
1989 Apr, May, Jul?, Aug