72% (1993)

55% (1992)

60% (1987)

52% (1995)

54% (1997)

63% (1988)

55% (1993)

52% (1987)

65% (1999)

61% (2000)

61% (1997)

66% (1994)

68% (2012)

64% (1987)

59% (1986)

64% (1989)

71% (1992)

53% (1998)

64% (1991)

62% (1985)