1995

7.6

2010

10.0

2002

7.5

1988

5.7

1979

6.7

2006

7.1

2001

8.1

1999

7.6

2005

7.4

2002

8.2

2006

6.1

2005

8.8

2000

6.2

1999

7.7

2014

0.0

1967

6.2

2016

7.5

2016

10.0

2015

4.8

2013

7.5