1994

6.2

2006

6.1

2016

6.7

2003

6.3

1999

4.6

2014

6.3

2012

5.8

2001

6.8

2017

6.9

1980

5.9

2005

5.2

2017

6.5

2003

6.8

2014

6.9

2013

6.9

2016

6.5

1989

6.2

2013

6.2

1959

6.1

1954

6.7