1957

7.8

2008

7.0

2006

6.2

2016

8.0

1999

6.5

2002

6.3

1970

7.2

2020

6.9

2015

7.8

1993

0.0

2009

7.1

2012

7.4

2006

6.9

1957

7.9

2018

8.0

2005

7.7

1962

8.4

1974

7.5

2006

6.4

2015

8.0