1939

7.0

1998

6.1

2008

7.7

2014

6.9

2019

7.3

2019

7.0

6.7

2017

5.5

1995

5.9

2015

8.1

2017

7.3

2012

4.3

2009

5.9

2019

6.9

2015

6.2

1980

5.9

2017

6.6

1969

6.6

1995

5.6

2006

6.8