65% (1980)

61% (2003)

59% (1982)

65% (2009)

62% (1984)

63% (1986)

55% (1988)

46% (1993)

49% (2001)

53% (1985)

61% (1972)

55% (1987)

53% (1989)

47% (1992)

48% (1987)

80% (1978)