62% (2012)

71% (2015)

78% (2008)

65% (2018)

54% (1984)

65% (1996)

63% (1997)

63% (1989)

61% (1994)

66% (1996)

77% (1993)

62% (1998)

58% (1989)

62% (1976)

60% (2003)

57% (1990)

75% (2010)

53% (2000)

70% (2001)

70% (1990)