2007

10.0

1996

5.8

2008

6.3

2009

5.5

2004

5.1

2013

6.2

1991

5.7

1967

6.5

2010

4.6

1993

5.8

1996

7.3

2011

7.1

2003

6.3

1978

6.9

1992

6.2

1966

6.5

2009

8.5

2013

7.6

1999

5.9

2001

7.4