71% (2000)

65% (1996)

70% (1987)

43% (1999)

50% (1998)

51% (1990)

57% (1998)

52% (1996)

61% (1997)

51% (1997)

46% (1994)

50% (2001)

57% (2000)

44% (1995)

31% (1999)

43% (2000)

49% (1995)

61% (2000)

42% (1995)

48% (1998)