2007

4.2

2015

4.5

1991

6.3

1940

5.5

1989

7.1

1938

5.5

2016

6.0

1939

6.0

1993

6.2

1973

6.7

2006

5.1

1998

6.8

2009

5.6

2013

3.0

2008

5.8

2008

6.3

2000

7.4

2017

6.7

2009

8.0

1997

7.4