2008

6.1

1991

6.7

1980

6.3

2005

4.3

2005

4.9

1993

7.3

1970

7.5

2003

5.5

1954

6.8

2009

5.4

2017

8.8

2002

6.2

1961

6.8

2008

6.0

2009

5.9

1946

6.4

2000

1.5

2020

4.7

2006

5.4

2007

6.4