66% (1999)

62% (1992)

68% (1988)

67% (1986)

60% (2008)

72% (1996)

44% (1992)

84% (1980)

64% (1981)

48% (1983)

43% (1998)

47% (1993)

52% (1985)

64% (1991)

58% (1997)

68% (1983)

55% (1986)

57% (1990)

60% (1988)

53% (1987)