2004

7.3

1997

7.4

2000

6.5

2007

7.0

1996

7.8

2014

5.3

1972

7.1

1947

6.4

1997

6.9

2003

7.8

1927

7.8

2001

6.7

1997

8.4

2005

5.2

2006

6.2

2005

5.4

1960

8.0

1946

7.5

2016

4.5

2017

6.3