2020

6.9

2018

6.3

2015

5.3

2014

5.8

2011

5.2

2017

7.3

1980

8.4

1969

7.1

2016

7.5

2006

6.1

2015

6.8

2005

6.7

2017

8.5

1986

7.7

1987

6.7

2017

6.9

1993

6.3

2020

5.9

2005

7.2

7.8