1998

5.6

2007

5.3

1990

7.4

2014

7.9

2008

7.6

2013

7.2

2005

6.7

1941

8.0

2012

7.3

1959

8.0

1990

8.5

1984

7.5

2013

6.5

2006

6.6

2012

7.4

2004

7.5

2009

7.8

2011

6.3

2003

7.4

2016

6.0