65% (1999)

73% (2004)

71% (1992)

56% (1996)

57% (1990)

70% (2001)

68% (1986)

73% (1992)

63% (1997)

53% (2003)

61% (2009)

55% (2008)

63% (1988)

62% (1988)

61% (1990)

64% (1989)

56% (1991)

70% (2005)

65% (1998)

69% (1993)