70% (1990)

62% (1996)

74% (1986)

56% (1993)

55% (2001)

65% (1989)

72% (1995)

54% (2011)

62% (1988)

54% (1994)

46% (2002)

64% (2000)

61% (1997)

59% (1993)

70% (1986)

46% (2003)

70% (1994)

52% (1989)

67% (1995)

71% (1984)