1994

5.4

2011

5.8

2010

7.9

2010

6.8

2004

7.3

2010

6.6

1963

7.1

1949

7.7

2006

4.1

1971

6.4

1952

6.7

2001

5.7

2011

4.7

1953

8.1

2009

4.8

2008

6.1

2003

6.3

1964

7.3

2012

6.4

2006

6.6