60% (1989)

70% (1987)

57% (1993)

54% (1981)

35% (2001)

47% (1970)

50% (1988)

0% (1996)

62% (1988)

45% (2001)

42% (1988)

0% (1995)

40% (1988)

62% (1990)

30% (1982)

0% (1995)

35% (1996)

0% (1988)