65% (1995)

59% (1990)

58% (1993)

43% (2001)

44% (2002)

73% (1976)

55% (1989)

57% (1993)

61% (1997)

60% (1998)

59% (2000)

65% (1999)

51% (1990)

53% (1992)

49% (1995)

50% (1986)

60% (1994)

42% (1987)

58% (1981)

55% (1998)