2017

5.4

2012

6.3

2011

7.4

2004

5.7

2010

5.9

1994

4.8

1997

5.1

2014

6.1

6.6

1990

5.8

2017

7.5

2013

7.3

1955

7.1

2018

6.9

2002

5.5

2016

5.9

2004

7.3

2017

6.5

2017

5.0

2018

6.7