66% (1985)

69% (1990)

64% (1989)

63% (1991)

51% (1994)

60% (1993)

65% (1987)

62% (1993)

62% (1985)

64% (1986)

65% (1994)

54% (1988)

60% (1995)

66% (1988)

0% (1996)