65% (1999)

73% (2004)

70% (1992)

70% (2001)

63% (1997)

68% (1986)

72% (1992)

61% (1990)

55% (2008)

42% (1986)

62% (1988)

57% (1990)

61% (2009)

63% (1988)

56% (1996)

56% (1991)

64% (1989)

70% (2005)

65% (1998)

53% (2003)