1938

5.9

2014

7.5

1987

7.3

1973

7.0

1993

6.7

2014

6.4

2013

4.5

2013

6.0

1978

6.3

2013

5.0

2017

7.0

1990

7.1

2017

4.6

2007

6.9

2017

6.1

2014

3.1

1997

6.5

2010

5.5

1965

6.8

2017

5.8