79% (1993)

75% (1990)

73% (2002)

83% (2006)

71% (2015)

76% (2006)

64% (2002)

63% (2002)

72% (2009)

76% (1988)

60% (1999)

77% (2002)

63% (1991)

69% (1986)

61% (1998)

64% (2014)

73% (1999)

71% (2016)

74% (1998)

60% (2003)