1939

7.8

2012

6.1

2017

6.5

1921

6.8

1953

7.1

1977

8.0

2019

6.8

1949

7.0

1952

6.7

2000

6.9

7.8

1985

8.2

2002

7.4

1985

6.2

1980

6.6

1964

6.9

1972

7.9

2015

7.4

1959

5.5

1955

7.2