2016

6.5

2007

6.2

2006

5.8

2001

7.3

2007

7.5

1998

6.3

1999

6.9

2003

5.0

1996

5.6

2001

5.8

2018

6.1

2007

5.6

2006

4.8

2006

5.2

2003

8.1

2003

6.3

2008

7.3

1933

7.6

1923

6.0

1992

6.0