1982

7.1

1980

6.7

1997

6.8

1967

6.5

2007

6.2

2007

6.2

2010

4.8

1962

7.5

1962

7.8

1996

6.7

2012

7.0

2017

7.4

2011

5.5

2008

5.8

2011

7.6

1983

7.4

2007

5.5

1965

6.7

2012

5.3

1987

6.4