These are from a school library and some are in better condition than others; some years are missing issues; some have multiple copies.  As listed below:

1973:  1 May; 2 December 

1974:  2 April; 1 August; 1 September; 1 October; 1 December

1975:  1 June; 1 July; 1 November; 1 December

1976:  1 January; 1 April; 1 June; 1 July; 1 November

1977:  2 March

1978:  1 March; 1 May; 1 June

1979:  1 July

1980:  1 January; 1 February; 1 March; 1 April; 2 May; 1 June; 1 July; 1 August; 1 September; 2 December

1981:  1 February; 1 April; 2 June; 1 July; 1 August; 1 September; 1 October; 1 November; 2 December

1982:  1 January; 2 February; 1 March; 3 April; 1 May; 3 June; 1 July; 1 August; 1 September; 1 October; 1 November; 3 December

1983:  2 January; 2 February; 2 March; 2 April; 3 May; 1 June; 1 July; 1 August; 2 September; 1 October; 2 November; 2 December

1984:  4 January; 1 February; 3 March; 2 May; 1 June; 1 August; 2 September; 1 October; 3 November; 1 December

1985:  3 January; 1 February; 3 March; 2 April; 2 May; 2 June; 3 July; 3 August; 2 September; 2 October; 1 November; 1 December

1986:  3 January; 1 February; 3 March; 1 April; 1 May; 2 June; 1 July; 1 August; 2 September; 2 October; 2 November;

1987:  2 January; 2 March; 3 April; 2 May; 3 June; 1 July; 2 August; 2 September; 2 November; 2 December

1988:  1 January; 1 March; 2 April; 1 May; 1 June; 1 July; 1 August; 1 September; 2 October; 1 November; 1 December

1989:  2 January; 3 February; 2 March; 2 April; 2 May; 2 June; 4 July; 2 August; 3 September; 2 October; 2 November; 3 December

1990:  1 January; 2 February; 2 Aarch; 2 April; 1 May; 1 June; 1 July; 2 September; 2 October; 2 November; 2 December

1991:  2 January; 2 February; 2 March; 3 April; 1 May; 2 June; 2 July; 2 August; 3 September; 2 October; 3 November; 2 December

1992:  2 January; 2 February; 1 March; 2 April; 1 May; 1 June; 1 August; 1 November

no 1993

1994:  1 January; 1 February; 1 April; 1 May; 1 June; 1 July; 1 August; 1 September; 1 October; 1 November

1995:  2 January; 2 February

January 1997;  January 1998; September 2000