65% (1986)

65% (1987)

64% (1989)

65% (1985)

51% (1994)

63% (1991)

54% (1988)

62% (1985)

60% (1995)

60% (1993)

65% (1994)

66% (1988)

62% (1993)

68% (1990)

0% (1996)