1963

5.9

1970

6.0

1990

6.4

2010

6.0

1956

6.2

2012

7.1

2020

7.3

2021

7.7

2010

6.8

1970

6.3

2017

7.2

1976

6.6

2008

5.7

1989

5.1

2021

5.7

2020

6.3

2022

5.4

2017

6.9

1995

6.8