1961

7.2

1973

4.7

2014

7.0

2005

6.7

1972

7.4

1952

6.7

1956

7.0

1947

7.5

1986

5.3

2009

6.1

1957

5.6

1991

6.5

1934

5.9

1949

6.4

2018

6.3

1950

8.3

1951

6.5

1943

6.7

1950

6.9

1980

4.8