73% (1976)

64% (1981)

60% (1972)

68% (1988)

65% (1978)

75% (1991)

62% (1976)

72% (1999)

64% (1980)

41% (2006)

63% (1977)

62% (1974)

66% (2001)

66% (1985)

67% (1974)

52% (2005)

71% (1999)

70% (2019)

64% (1984)

64% (1995)