73% (1994)

69% (1992)

67% (1993)

62% (1998)

58% (1992)

66% (1995)

59% (1994)

60% (1997)

68% (1998)

62% (1996)

60% (1993)

60% (1992)

71% (1993)

57% (1993)

61% (1992)

55% (1992)

63% (1996)

49% (1997)

63% (2007)

69% (1995)