2011

7.1

1984

7.0

1989

5.5

1995

5.6

1987

5.2

2017

8.2

1994

7.4

2004

5.6

1933

6.2

2008

5.8

2014

5.7

1921

6.8

2009

5.9

1968

6.9

1995

4.6

1988

6.4

2005

5.2

2003

6.8

1989

6.2

1999

6.2