2011

6.4

2016

8.0

2018

7.5

5.8

2016

8.5

2015

5.9

2017

6.2

1992

5.8

2010

7.0

2013

7.1

1997

8.1

1938

4.0

1996

5.3

2015

8.1

1976

6.6

2012

7.6

1998

7.3

1982

7.2

2021

5.8

2007

6.9