2015

7.2

2005

7.1

2014

7.9

2017

6.0

2013

7.9

2013

8.1

1995

8.1

2010

7.4

2011

6.7

1988

6.5

2008

7.6

2010

7.2

2016

7.1

1984

6.8

1989

8.0

1971

7.9

1988

7.1

1962

7.8

2005

7.7

1965

6.0