20 - 24 February, 1977

22 - 30 May, 1977

06 - 09 November, 1977

23 - 26 April, 1978

19 - 22 November, 1978

22 - 25 April, 1979

16 - 21 September, 1979

26 September, 1979

31 July, 2016

29 - 31 October, 2016