1939

6.7

1971

5.5

1964

6.1

1970

5.9

1972

4.8

1932

7.3

2001

7.8

1967

7.6

1988

7.0

2013

3.4

1999

6.5

1922

7.7

2001

8.4

2002

8.4

2003

8.5

1931

7.2

1984

7.0

2014

4.8

1921

6.3

1992

6.0