2004

6.5

2014

6.8

2014

5.4

2013

7.4

2015

7.2

2009

6.7

2009

5.0

2009

5.8

2016

6.7

1999

4.8

2008

4.0

2006

6.2

2001

7.9

1977

6.3

1979

6.3

1969

6.0

1999

6.6

1992

8.0

1997

4.8

2015

5.3