66% (1987)

60% (1983)

54% (2007)

48% (1986)

50% (1985)

60% (1982)

70% (2005)

53% (2010)

65% (2011)

40% (1995)

0% (1994)

61% (1973)

69% (1992)

42% (1996)

61% (2008)

51% (1972)

0% (1980)

48% (1988)

55% (2007)

60% (1983)