65% (1993)

72% (1992)

61% (1981)

66% (1992)

54% (1994)

58% (1982)

64% (1985)

64% (1991)

54% (1991)

53% (1980)

0% (1979)

0% (1989)

55% (1997)

60% (1993)

60% (1988)

50% (1985)

50% (1991)

55% (1993)

50% (1997)

70% (1996)