1994

7.4

2012

6.0

2010

5.1

2014

3.3

2003

0.0

2007

6.4

2006

6.3

2003

6.6

1970

3.8

1991

4.5

1973

3.7

2006

6.2

1996

5.5

2002

6.4

2013

0.0

1968

6.4

1995

6.5

2004

5.3

2008

5.5

2003

6.0