62% (2001)

53% (1999)

63% (1998)

62% (1998)

68% (1996)

53% (2000)

61% (1995)

59% (2001)

39% (1994)

45% (1995)

73% (1999)

62% (2000)

50% (1999)

63% (2001)

49% (1995)

33% (1998)

44% (1992)

43% (1998)

50% (1989)

40% (1997)