2017

8.5

1991

5.3

2007

6.6

1985

5.9

2004

6.7

2009

5.8

2009

4.2

2009

3.8

1950

7.0

1996

6.9

1992

7.0

2008

5.9

2009

7.0

2001

6.7

2009

5.7

1962

7.4

2009

5.9

2007

5.6