73% (1994)

30% (1987)

67% (2001)

87% (1981)

72% (2002)

0% (1970)

0% (1995)

10% (1993)

80% (1997)

60% (1990)

67% (1973)

60% (1993)

0% (1982)

70% (2001)

0% (1993)

0% (1997)

72% (1975)

60% (2002)

75% (2005)

35% (1979)