1982

5.7

2013

6.9

1983

7.9

2004

8.0

2011

8.1

2006

6.4

2007

5.2

1994

6.5

2003

6.5

2007

5.6

2011

5.5

2010

6.2

2009

7.7

1982

7.5

1956

7.2

2005

7.8

1986

5.8

2001

7.4

1994

7.0

2013

6.7