69% (1985)

57% (1978)

52% (1997)

18% (1992)

36% (1972)

62% (2005)

70% (1980)

67% (1978)

60% (1979)

59% (2009)

65% (1992)

66% (1983)

69% (2005)

69% (1978)

53% (1983)

60% (1996)

62% (1996)

75% (1993)

67% (1996)

71% (1989)