1982

6.1

1996

6.2

2008

5.5

2006

7.8

1996

7.5

2014

0.0

1965

6.6

1982

4.6

1958

4.8

1993

6.7

1972

5.1

2009

6.5

1993

5.1

1977

6.5

2008

4.5

2004

4.3

2010

4.2

1999

6.8

2007

4.9

1984

6.5