1993

5.5

1984

7.2

1997

7.6

2019

8.1

1947

7.3

1998

6.8

1959

6.8

2018

7.1

1975

6.4

2015

6.3

1983

6.5

1985

7.4

2009

4.6

2020

6.0

2008

6.9

1966

6.5

2018

7.0

1987

7.8

1993

7.0

2018

6.6