1935

5.0

1994

6.2

2011

7.1

2003

6.5

1997

7.9

2012

7.4

2013

5.7

1999

6.6

2007

7.2

2005

5.4

2008

7.3

2006

6.4

2013

6.5

2009

5.5

1994

7.0

2007

5.8

2010

8.2

2010

7.8

2013

7.7

2007

6.4