1995

8.2

2020

6.7

2015

7.1

2019

7.3

2016

6.4

1977

7.0

2007

4.2

1933

5.8

1958

0.0

2008

6.5

1988

7.7

1941

6.5

1989

6.5

2017

6.2

2001

6.2

1979

6.8

2002

6.1

2014

7.1

1981

7.6

2004

5.0