55% (1999)

62% (2001)

48% (2004)

64% (1985)

69% (1996)

58% (2007)

70% (2007)

43% (1992)

71% (1994)

57% (1991)

60% (2002)

48% (2010)

72% (1992)

73% (1987)

64% (1992)

61% (1997)

65% (1987)

60% (1987)

64% (1995)

61% (2015)