1962

7.0

1963

7.1

1964

7.4

1967

6.6

1969

6.6

1977

6.8

1979

6.2

1963

7.0

1964

7.0

2010

5.5

2014

6.1

1972

7.1

1988

7.8

1997

7.1

2001

7.4

1975

7.7

2006

6.7

1977

7.1

1996

6.4

1946

7.6