51% (1978)

58% (1983)

67% (1992)

56% (1977)

46% (1979)

59% (1981)

61% (1982)

60% (1991)

64% (1982)

60% (1975)

52% (1986)

63% (1984)

50% (1996)

0% (2000)

20% (1995)

55% (2001)

50% (1989)

30% (1976)

49% (2018)

46% (1980)