60% (2001)

65% (1999)

79% (2003)

71% (1997)

42% (1998)

55% (2001)

53% (2003)

51% (2000)

58% (2002)

0% (1992)

0% (1990)

60% (1989)

0% (1991)

0% (1995)

60% (1994)

45% (1988)

60% (2003)

0% (1993)

0% (1986)

0% (1992)