59% (1991)

45% (1989)

57% (1993)

57% (1997)

58% (1990)

49% (1997)

74% (1999)

48% (2000)

66% (1991)

66% (1995)

60% (1999)

54% (1996)

54% (2001)

45% (1996)

43% (1988)

48% (1997)

61% (2000)

50% (1993)

53% (1988)

50% (2001)