1927

8.1

1995

7.6

2005

6.5

2000

8.2

1982

7.9

2003

7.8

1932

7.8

2004

7.4

2013

4.3

2017

4.0

1990

7.7

2001

7.2

2005

6.3

2002

7.3

2006

5.8

2006

7.5

2005

7.5

2014

6.4

2004

7.7

1984

7.7