1967

7.4

2002

8.0

1984

7.1

2013

6.8

1994

7.8

1976

7.4

2000

4.0

5.8

2002

8.1

2005

2.8

2014

1.0

2012

9.0

1971

7.6

1996

8.5

2007

1.0

2004

6.8

1994

6.8

2012

0.0

2017

0.0

2013

5.8