63% (2006)

59% (2004)

60% (1994)

81% (1980)

47% (1998)

56% (1991)

63% (1996)

54% (1992)

57% (2003)

58% (2000)

75% (1997)

54% (1996)

53% (2003)

59% (1997)

63% (1991)

53% (1998)

66% (1991)

65% (1998)

71% (1998)

25% (1988)