1980

5.8

2011

7.0

1950

7.6

2017

5.4

2019

8.5

2004

6.0

1955

7.2

1995

6.0

1994

8.7

2010

7.7

1972

7.0

1982

5.2

2000

4.9

2016

6.7

1998

5.3

1993

6.6

1955

7.2

1960

7.2

2020

6.7

1995

6.8