1999

7.0

2013

6.4

2018

5.8

1982

5.8

1997

4.7

2007

4.6

1916

6.6

2012

5.0

2009

8.5

2010

6.9

2014

7.0

2010

7.0

2017

6.0

1969

6.3

2017

8.5