63% (1980)

68% (1973)

69% (1974)

70% (1978)

78% (1982)

73% (1983)

70% (2005)

60% (2002)

60% (1988)

80% (1997)

76% (2005)

70% (2000)

68% (2002)

0% (1997)

68% (1992)

40% (1990)

70% (1993)

78% (1994)

30% (1998)

75% (1991)