2011

5.6

2007

5.7

5.3

2017

5.9

1972

6.2

1972

7.4

2003

6.0

1991

4.9

1974

6.6

1994

6.8

2017

6.7

1996

6.5

2015

5.9

2015

6.9

1968

7.2

2020

6.7

6.4

1945

7.2

2017

6.9