71% (1993)

57% (2005)

58% (2004)

67% (1988)

75% (1994)

58% (1991)

68% (2012)

63% (2013)

74% (1998)

67% (1989)

68% (2005)

61% (2002)

60% (2003)

69% (2005)

66% (1999)

60% (2000)

62% (1990)

57% (2001)

63% (1988)

53% (1998)