1964

5.6

1996

5.7

2017

6.9

2019

6.0

1993

4.9

2020

6.2

2010

6.6

1980

7.2

2010

6.6

1950

7.4

2015

8.1

1939

7.9

1966

6.9

1980

6.9

2018

6.2

1973

6.9

1965

7.5

1981

6.1

1997

6.2