45% (2004)

54% (1996)

59% (2005)

77% (2003)

47% (2002)

25% (1988)

57% (1999)

56% (1993)

63% (2001)

64% (1990)

51% (2005)

65% (2004)

0% (1970)

60% (1996)

57% (1999)

57% (1990)

50% (1999)

48% (2000)

46% (1989)

55% (1995)