2014

5.6

2007

6.8

1994

8.5

1992

6.9

1965

8.0

2009

6.9

1980

6.4

2005

6.5

2006

6.7

2013

7.6

2012

6.3

1976

7.4

2009

7.9

2015

4.4

2003

5.7

1991

4.7

2010

6.1

1998

5.6

2009

7.0

1954

6.7