56% (1994)

63% (1992)

66% (1997)

61% (2001)

53% (2002)

48% (2004)

55% (1993)

59% (2002)

54% (2007)

43% (1982)

57% (1997)

51% (1989)

74% (2003)

62% (2002)

61% (1999)

48% (1996)

54% (1995)

67% (1992)

54% (1996)

58% (1999)