6.4

2011

7.1

2010

6.6

2015

7.9

1993

6.1

6.7

1988

5.5

1941

8.0

1911

9.5

2021

7.4

1968

6.9

2018

7.1

2018

5.5

2012

7.7

1994

6.1

2001

6.9

2017

7.7

2017

6.7

1994

7.2

1996

6.5