77% (1973)

70% (1977)

67% (1976)

72% (2011)

75% (2015)

62% (1978)

64% (1976)

53% (1981)

70% (2018)

71% (1977)

65% (1995)

72% (1975)

70% (1978)

74% (2003)

40% (2011)

71% (1976)

45% (1993)

69% (1978)

72% (1991)

52% (1977)