1934

6.5

1984

6.9

1983

6.7

1981

5.7

2014

5.4

1955

6.3

1944

6.5

1971

6.1

2009

6.1

1968

6.6

1931

7.0

2011

6.5

1958

6.9

1985

4.4

1990

5.8

2014

8.0

1988

6.3

2015

6.0

1992

5.7

1992

5.9