2014

7.4

2015

7.8

2017

7.5

2019

8.1

1976

6.7

1972

7.9

2000

6.3

2014

5.9

2018

6.8

2006

7.5

1946

7.8

1970

6.8

2013

5.8

2001

7.8

1982

8.0

1961

6.9

2008

6.5

1996

4.0

2000

7.1

2005

5.2