67% (1986)

66% (1999)

63% (1981)

72% (1996)

57% (1990)

58% (1997)

60% (2008)

60% (1988)

62% (1992)

47% (1993)

64% (1991)

68% (1983)

68% (1988)

35% (2006)

52% (1985)

84% (1980)

55% (1986)

45% (1993)

57% (1986)

53% (1987)