1980

6.3

2015

7.4

2013

6.1

2018

5.5

6.1

1895

5.4

2015

5.8

2003

6.2

10.0

2016

7.0

1999

7.1

2017

6.0

1975

5.3

2009

7.6

2010

8.4

2010

7.1

1985

7.3

2011

6.9