48% (1995)

43% (1996)

41% (1991)

42% (1995)

47% (1991)

44% (1994)

39% (1991)

35% (1993)

52% (1991)

46% (1987)

22% (1967)

40% (2004)

35% (1992)

44% (2011)

40% (1994)

32% (1996)

49% (1990)

23% (1997)

38% (1995)

47% (1995)