65% (1999)

72% (2004)

70% (2001)

68% (1986)

70% (1992)

72% (1992)

63% (1988)

63% (1997)

61% (2009)

62% (1988)

56% (1991)

56% (1996)

57% (1990)

55% (2008)

64% (1989)

60% (1990)

53% (2003)

70% (2005)

65% (1998)

42% (1986)