55% (1979)

64% (1982)

40% (2002)

65% (1987)

50% (2004)

68% (2001)

57% (1990)

30% (1998)

100% (2008)

0% (1960)

65% (1987)

50% (1996)

0% (1988)

10% (1989)

30% (1979)

55% (1999)

70% (1983)

46% (1996)

70% (1960)

60% (1972)