1956

4.7

1972

5.2

1976

6.0

2014

7.1

2017

6.8

1991

6.1

1983

7.4

1990

6.4

2003

6.9

1994

5.2

2011

6.7

1947

6.0

1997

6.9

1973

6.9

1992

6.7

2020

5.1

1977

6.9

1989

6.3

2023

0.0

1976

7.8