72% (1998)

63% (1987)

61% (1989)

63% (1998)

55% (1999)

61% (1999)

60% (1988)

42% (1996)

69% (1989)

59% (1997)

62% (1990)

66% (1989)

69% (1992)

66% (1997)

59% (1990)

60% (1987)

61% (1997)

61% (1988)

57% (1990)

68% (2000)