35% (1985)

59% (1974)

86% (1980)

55% (1972)

60% (1978)

58% (2009)

71% (2001)

40% (2003)

53% (2000)

50% (2002)

58% (1980)

36% (1998)

60% (1979)

34% (2000)

0% (1997)

50% (1976)

54% (1969)

70% (1978)

57% (1997)

70% (1995)