1958

6.9

2016

8.2

2015

6.8

2013

8.0

1988

7.3

1970

7.3

2010

6.6

2010

8.2

1964

7.6

2012

7.7

2014

6.5

1902

7.9

1994

6.2

2013

6.6

2013

5.9

2008

5.7

2007

7.1

2013

6.9

1998

7.8

2005

7.0