60% (2001)

79% (2003)

53% (2003)

63% (1999)

58% (2002)

51% (2000)

71% (1997)

55% (2001)

58% (2004)

42% (1998)

45% (1988)

0% (1995)

60% (2003)

0% (1985)

50% (1996)

0% (1991)

0% (1995)

0% (1990)

60% (1994)

0% (1994)