79% (1990)

71% (1994)

72% (1989)

61% (1997)

55% (1996)

63% (1994)

49% (1992)

59% (1996)

35% (1990)

56% (1991)

76% (1995)

63% (1994)

57% (1996)

40% (1996)

40% (1997)