2009

9.7

2017

8.2

2011

7.0

2014

9.0

2002

10.0

1968

8.0

1977

6.2

1999

5.5

1999

6.0

1987

6.8

2001

5.9

1994

7.3

2008

4.9

2002

6.4

2005

5.1

1983

7.3

1982

7.2

1993

6.9

2006

5.0

1997

6.4