1957

8.5

1966

7.7

1989

7.2

1969

5.5

2015

7.0

2020

8.1

1994

7.3

1990

7.0

1996

6.7

2018

6.5

1982

7.6

2019

6.0

2019

7.7

1951

5.3

1987

7.0

1996

6.1

2001

6.7

2023

10.0

1926

4.3

2013

6.8