64% (1993)

55% (1994)

72% (1992)

65% (1992)

60% (1981)

64% (1991)

64% (1985)

50% (1991)

55% (1997)

53% (1980)

40% (1979)

58% (1982)

50% (1985)

55% (1993)

60% (1993)

60% (1988)

53% (1991)

0% (1989)

70% (1996)

50% (1997)