2004

6.2

1999

6.8

2014

6.4

2003

6.7

2005

5.3

2009

6.3

2015

3.8

1994

1.0

2001

7.4

2003

7.5

2007

6.0

1994

7.0

2005

2.4

2011

5.0

1971

6.4

1998

7.3

1970

6.1

2004

6.1

2006

6.6

2013

5.5

2005

6.2