1979

7.1

2006

6.3

1973

9.2

2000

6.7

1965

7.3

1940

7.0

2014

5.4

1996

7.0

1986

5.7

2018

7.7

1991

5.3

1972

6.9

2017

7.9

1991

5.9

1976

5.6

1993

6.5

2018

7.3

2020

5.8

1986

5.7

1988

5.7