1998

6.4

2016

6.9

2014

7.3

2012

8.2

1972

8.7

2016

7.6

2016

7.5

2008

7.7

2018

6.8

2000

8.2

2008

8.5

2014

8.5

1999

8.4

1988

8.1

1994

8.5

1957

8.5

2009

7.6

1954

8.4

2014

7.7

2010

7.7