2004

5.6

1987

6.5

1995

5.4

2008

5.2

2017

6.6

2006

6.7

2005

6.1

1959

6.9

2015

4.7

2006

6.5

2018

7.1

2005

5.7

2013

5.5

2008

6.7

1965

7.0

1967

6.5

2003

5.3

1963

6.8

1953

6.4

1996

5.3