66% (1990)

60% (1995)

54% (1992)

66% (1990)

56% (1991)

48% (1998)

40% (1994)

42% (1995)

30% (1995)

53% (1996)

43% (1998)

59% (1992)

34% (1996)

54% (1995)

58% (1993)

61% (1959)

35% (1996)

38% (1994)

38% (1999)

35% (2007)