57% (1987)

46% (1998)

58% (2004)

57% (1993)

57% (1998)

51% (1994)

66% (1990)

58% (1990)

62% (1991)

59% (1997)

52% (1991)

55% (2000)

47% (1990)

31% (1994)

51% (1995)

52% (1985)

42% (1995)

40% (1996)

54% (1996)

63% (1993)