62% (1992)

66% (1997)

54% (1995)

55% (1994)

55% (1993)

54% (1996)

61% (2001)

73% (2003)

50% (2001)

51% (2006)

53% (2002)

48% (1996)

59% (2002)

66% (2003)

62% (2002)

46% (2001)

55% (2007)

53% (1984)

57% (1997)

41% (2007)