67% (1985)

68% (1977)

69% (1997)

70% (2005)

46% (1991)

64% (1979)

50% (1992)

38% (2008)

50% (1986)

0% (1993)

45% (1992)

56% (1974)

56% (2002)

63% (1986)

69% (1993)

0% (1994)

77% (1994)

0% (1990)

48% (2007)

63% (2017)