2004

6.0

1979

6.1

2006

5.5

2011

6.2

2009

5.3

1998

6.6

2013

7.6

2011

5.9

1968

6.5

2005

5.5

2013

8.1

2000

5.2

2013

6.1

2007

5.7

2006

6.1

2011

6.9

2001

6.2

2003

7.4

2012

5.1

1989

5.2