2011

7.1

2015

6.4

2006

6.9

2015

5.0

2008

5.6

2009

7.5

2003

7.1

1995

8.0

5.0

1995

5.4

2014

7.3

2005

4.2

1973

7.4

1927

7.8

1998

6.0

1997

6.2

2009

7.9

2015

5.7

1961

8.4

2006

7.4