81% (1981)

60% (1978)

56% (1986)

74% (1993)

58% (1990)

67% (2000)

70% (1985)

60% (2021)

71% (2001)

74% (2002)

72% (1977)

70% (2005)

57% (2015)

61% (2007)

63% (1997)

58% (2002)

61% (1969)

74% (1972)

61% (1982)

58% (1962)