2016

5.9

2008

6.0

1997

4.6

2017

7.1

2015

6.3

2018

6.1

2007

6.7

1987

7.5

2018

6.6

1989

5.1

2018

5.0

1970

6.3

1982

6.7

2017

7.2

1982

6.4

1962

8.0

2017

6.4

1961

7.3

2005

6.5

2001

6.4