67% (1990)

46% (1995)

63% (1988)

62% (1994)

46% (1995)

58% (1993)

48% (1994)

52% (1995)

45% (1993)

58% (1994)

49% (1995)

48% (1993)

48% (1995)

47% (1994)

65% (1991)

45% (1994)

49% (1995)

52% (1996)

41% (1978)

26% (1994)