2019

6.0

2009

7.0

2018

7.3

1990

5.8

2016

7.7

1971

7.8

2012

6.5

2015

6.5

1998

4.8

1993

6.9

2011

5.9

2016

5.9

2016

8.9

2007

5.7

2015

6.8

2018

7.1

2001

6.1

2018

5.8

1964

7.4

2017

5.8