68% (1988)

68% (1986)

58% (1997)

44% (1992)

66% (1999)

53% (1987)

75% (1995)

64% (1981)

61% (2008)

72% (1996)

62% (1992)

64% (1991)

25% (1990)

47% (1993)

80% (1987)

68% (1983)

55% (1986)

57% (1990)

75% (1983)

48% (1983)