2003

7.6

1977

7.3

2006

7.5

2004

7.4

2003

6.6

2005

4.0

1974

5.2

1986

5.0

1987

7.7

1996

7.3

1999

6.8

2008

7.6

1991

7.2

2006

0.0

1999

7.5

2013

6.8

2007

7.5

2013

7.8

2013

6.9

2013

7.2