69% (1988)

64% (1978)

64% (1981)

73% (1976)

59% (1998)

75% (1991)

63% (1976)

67% (1974)

64% (1980)

61% (1972)

71% (1999)

63% (1977)

41% (2006)

62% (1974)

61% (1975)

66% (2001)

52% (2005)

72% (1999)

67% (1985)

69% (2019)