62% (1998)

63% (1995)

56% (2002)

53% (1994)

68% (2005)

72% (2010)

62% (2008)

54% (1988)

58% (1996)

53% (2004)

65% (2004)

69% (1997)

66% (1988)

66% (1988)

61% (1998)

59% (1990)

65% (1987)

63% (1991)

60% (2003)

67% (1998)