61% (2009)

71% (1986)

61% (2013)

72% (1992)

62% (1980)

67% (1996)

71% (1981)

65% (1995)

70% (1984)

55% (1987)

70% (1999)

72% (1989)

62% (1999)

56% (1991)

64% (2002)

60% (1980)

71% (1990)

68% (2003)

75% (2016)

55% (1977)