2008

6.5

1995

6.3

2006

6.2

2008

7.8

2003

6.3

1975

6.0

2011

7.0

1988

7.4

2014

0.0

1942

10.0

2017

4.8

2002

0.0

1996

5.4

1998

6.9

2010

6.0

1998

6.6

1980

6.7

2015

8.7

2018

0.0

2015

6.5