73% (1987)

61% (1986)

57% (1993)

62% (1991)

60% (1985)

71% (1992)

60% (1982)

62% (1988)

61% (2001)

61% (2000)

67% (1972)

68% (1986)

59% (1999)

61% (1994)

71% (1981)

63% (1992)

72% (1982)

70% (1979)

80% (1984)

60% (1973)