2006

6.4

2015

7.2

2016

6.6

2004

7.3

2007

5.8

2010

5.9

2012

6.4

2015

5.3

1996

7.1

2015

8.0

2003

7.4

2015

7.3

2012

7.1

1951

5.1

2017

6.9

2002

7.5

1974

6.3

2012

6.8

2016

7.9

1986

6.3