2014

6.8

2007

4.9

2011

5.5

1986

5.8

1962

7.9

1993

7.3

2010

7.0

1971

6.4

1984

5.4

1997

6.0

2018

7.1

2005

7.1

2016

7.4

2017

6.6

2015

6.2

2017

8.0

1993

6.3

2004

5.8

2016

5.4

2013

8.0