1993

6.6

2020

5.4

2009

5.9

2014

7.0

2006

9.9

2002

5.0

2003

7.3

1988

6.4

2001

6.1

2012

9.7

2011

9.5

2013

8.5

1989

5.3

1949

6.2

1940

6.3

1981

6.3

2007

7.7

1996

6.5

2012

7.7

1996

5.3