63% (1980)

72% (1989)

61% (2009)

61% (2013)

71% (1986)

70% (1984)

72% (1992)

67% (1996)

65% (1995)

71% (1981)

70% (1999)

62% (1999)

64% (2002)

68% (2003)

71% (1990)

55% (1987)

75% (2016)

56% (1991)

0% (1979)

69% (1987)