2003

6.8

2013

6.2

1984

6.1

1976

6.9

2010

6.6

1991

7.0

6.3

2012

9.7

2002

4.7

2017

6.6

1969

6.7

2001

4.8

2006

6.1

1941

7.0

2013

6.7

1971

6.1

1987

6.0

2005

5.2

1969

7.0

2001

6.8