71% (2003)

48% (1997)

71% (2001)

52% (1980)

56% (1994)

48% (1993)

57% (1994)

79% (1992)

62% (1986)

77% (1987)

68% (1990)

55% (1980)

63% (2000)

42% (1996)

57% (1990)

72% (1995)

58% (2003)

70% (1985)

72% (1991)

68% (1988)