2004

6.2

1999

6.8

2014

6.4

2005

5.2

2009

7.0

2015

3.8

1994

1.0

2001

7.4

2003

7.6

2007

5.9

1994

7.0

2005

2.4

2011

5.0

1971

6.4

1998

7.3

1970

6.2

2003

6.2

2004

6.0

2006

6.6

2005

6.2