61% (2012)

62% (1976)

60% (2015)

68% (1998)

57% (2009)

62% (2013)

52% (1985)

58% (1982)

75% (1972)

30% (1989)

20% (1988)

40% (1996)

30% (2001)

36% (1983)

70% (1981)

57% (1971)

67% (1991)

57% (1980)

62% (1979)