56% (2002)

67% (1996)

50% (1998)

51% (2006)

50% (2001)

65% (2004)

58% (1999)

57% (1989)

54% (1987)

47% (2001)

41% (2007)

66% (2003)

68% (1983)

61% (1999)

40% (1993)

72% (2002)

59% (2002)

46% (2001)

43% (1996)

55% (2001)