51% (1978)

58% (1983)

68% (1992)

61% (1982)

56% (1977)

46% (1979)

63% (1984)

60% (1991)

49% (2018)

59% (1981)

60% (1975)

55% (2001)

64% (1982)

50% (1994)

20% (1995)

46% (1980)

52% (1986)

50% (1989)

40% (1979)

30% (1976)