70% (2001)

73% (2004)

65% (1999)

70% (1992)

57% (1996)

73% (1992)

63% (1997)

70% (2005)

63% (1988)

56% (1991)

60% (1990)

55% (2008)

64% (1989)

68% (1986)

62% (1988)

57% (1990)

45% (2008)

46% (2003)

61% (2009)

53% (2003)