48% (1989)

54% (1991)

57% (1994)

63% (1997)

45% (1996)

44% (1992)

33% (1990)

44% (1998)

35% (1990)

46% (1997)

38% (1993)

47% (1997)

44% (1991)

36% (1989)

40% (1996)

53% (1994)

71% (1995)

47% (1995)

53% (1998)

45% (1994)