2004

4.7

1956

7.2

1997

5.1

2010

6.8

2008

4.5

1998

5.1

2006

6.5

2007

4.9

2005

6.2

2013

7.1

2012

6.9

1986

6.3

1960

7.3

1998

6.0

1999

6.8

2010

5.8

1971

6.9

2008

7.5

2013

6.6