73% (2003)

60% (1986)

75% (1994)

66% (1997)

71% (2004)

75% (1999)

69% (1997)

65% (1991)

69% (1987)

66% (1999)

65% (1999)

57% (2005)

69% (2005)

69% (2006)

63% (1990)

62% (1998)

63% (1995)

61% (2002)

65% (2004)

65% (1998)