1927

8.1

1968

8.1

1996

6.4

1979

6.5

2004

6.7

2008

7.5

2001

5.1

2000

5.1

1986

5.8

2020

5.7

1965

3.8

1997

6.5

1989

4.6

2009

6.9

2017

7.0

1995

6.2

1991

5.2

2015

7.6

1977

5.9

2020

7.3