62% (1988)

62% (1990)

53% (1986)

57% (1989)

71% (1981)

70% (1984)

73% (1982)

54% (1983)

70% (1994)

70% (1983)

67% (1992)

60% (1988)

70% (1991)

61% (1986)

55% (1991)

66% (1982)

67% (1995)

70% (1987)

53% (1986)

55% (1989)