1992

6.6

2003

8.1

2003

6.4

2008

7.3

2013

5.7

1962

4.0

2007

6.2

2013

5.5

2006

5.8

2001

7.3

2006

4.9

2013

6.5

2008

5.4

1958

5.0

1959

6.4

1998

6.3

1999

6.8

1996

5.6

2006

5.2

2003

4.9