2001

6.8

1976

7.1

1995

7.2

1996

7.0

2006

7.4

2010

5.3

1967

5.3

1993

5.5

2011

7.5

2003

6.0

1973

0.0

2013

3.4

1996

8.0

2012

5.0

1989

7.0

8.0

1999

0.0

1981

8.0

2008

4.0

2013

7.5