40% (1999)

36% (2003)

60% (1996)

35% (2007)

40% (2004)

60% (1999)

0% (1989)

10% (1995)

60% (1999)

10% (1995)

0% (1993)

60% (1987)

0% (1987)

20% (1983)

20% (1997)

57% (2004)

0% (1988)

40% (1987)

0% (1991)

10% (2001)