2018

6.7

2007

5.4

1998

6.2

2014

6.0

2019

7.7

2015

5.1

2014

5.8

2005

4.8

2007

6.9

2017

6.1

1983

7.5

2008

6.6

1975

4.5

2015

6.0

1989

5.8

2013

6.1

1985

5.9

1965

6.7