1997

7.4

1986

7.5

1953

8.0

1955

7.5

1940

7.9

1983

7.2

1930

7.3

1986

7.9

1972

8.7

1974

8.6

2002

6.7

2005

6.8

1994

8.5

2014

6.6

1982

6.5

1955

5.2

1996

6.0

1984

0.0

2017

6.9

2019

6.8