2007

7.5

1990

7.2

2012

0.0

2004

8.5

1991

6.9

2004

6.0

1975

6.9

1987

7.0

1999

7.5

1996

6.4

2001

6.6

2010

5.0

2013

7.2

2007

7.9

1990

7.9

1976

0.0

2004

7.5

1967

7.4

2000

8.5

2002

8.0