1966

6.2

2014

6.7

2004

6.0

2013

6.2

2003

6.8

1971

6.8

2017

6.6

1987

5.2

1959

6.1

1940

6.3

2014

5.3

1980

6.0

2006

6.1

1987

6.0

1988

6.5

2015

6.9

1986

6.2

2008

5.8

2007

5.4

2010

6.6