1950

8.1

1930

7.3

1994

7.1

2002

7.2

2014

7.4

2015

6.8

1943

8.2

1993

6.5

2017

6.5

2017

5.5

2017

7.5

1972

6.2

2008

6.2

1973

5.7

2005

6.2

2003

6.0

2008

6.0

1976

6.4

2007

6.7

2017

4.6