51% (1992)

66% (1995)

50% (1997)

53% (1993)

54% (1996)

47% (1991)

55% (1995)

61% (1995)

51% (1999)

54% (1995)

63% (1996)

67% (1993)

59% (1993)

55% (1996)

53% (1994)

62% (1997)

51% (1994)

61% (1994)

61% (1992)

59% (1995)