1950

4.4

1990

6.4

2006

4.9

1951

6.4

2000

5.9

1933

7.5

2019

6.7

1999

5.8

1970

3.3

1940

6.2

1940

5.7

1944

5.6

1942

5.8

1962

6.5

1981

6.8

2018

1.0

1939

4.3

1979

2.0

2017

4.0

2014

6.3