55% (1999)

61% (2001)

48% (2004)

74% (1987)

63% (1985)

71% (1992)

72% (1994)

69% (1996)

61% (1987)

58% (2002)

70% (2007)

57% (2007)

64% (1992)

64% (1995)

49% (2010)

57% (1991)

65% (1996)

65% (2008)

61% (2015)

62% (2018)