1987

4.8

2003

5.7

2006

5.5

2020

5.1

1979

6.3

2017

5.0

2016

4.8

1941

6.7

1940

6.5

2008

4.5

1959

6.8

2013

5.5

2003

5.4

1973

6.7

1989

6.9

1988

6.1

2016

4.0

2019

4.3

1961

7.5

1944

6.9