60% (1980)

55% (1975)

66% (1968)

78% (1961)

80% (1988)

51% (2003)

44% (1999)

60% (1992)

0% (1988)

72% (1990)

62% (1979)

0% (1963)

30% (2001)

66% (1993)

61% (1953)

70% (1970)

32% (1997)

37% (1947)

38% (2008)

60% (1989)