50% (2005)

49% (2001)

81% (1995)

79% (2000)

80% (2004)

61% (1999)

70% (2002)

81% (2006)

65% (1998)

76% (2011)

74% (2014)

52% (1983)

53% (1997)

75% (2015)

56% (2004)

50% (1988)

64% (1991)

67% (2016)

71% (2017)

73% (1985)