60% (1994)

35% (1999)

55% (2001)

57% (1997)

46% (1992)

70% (1981)

0% (1991)

50% (1993)

63% (1981)

61% (2001)

60% (1992)

52% (1997)

40% (1991)

60% (1986)

30% (1992)

70% (1987)

45% (1996)