61% (1982)

64% (1996)

54% (1983)

63% (1980)

51% (1972)

60% (1981)

60% (1988)

54% (1998)

61% (1986)

63% (1983)

61% (1977)

75% (1983)

60% (1975)

53% (1999)

62% (1978)

57% (1983)

58% (1985)

53% (1973)

46% (1984)

57% (1972)