1979

8.3

1994

8.5

1951

7.4

1998

8.2

1987

8.1

2015

1.0

2019

5.8

2023

7.2

1967

6.5

2019

7.1

2001

6.2

1988

4.5

1943

6.4

2003

6.5

1957

6.0

2007

7.6

2016

8.4

1948

6.4

2005

7.5

1955

6.9