61% (1998)

53% (1995)

59% (1992)

60% (2002)

52% (1997)

41% (1999)

62% (1995)

48% (2001)

60% (2001)

62% (2003)

50% (1987)

51% (1993)

61% (1990)

55% (1999)

53% (2001)

38% (1996)