1973

6.8

1974

5.1

2002

7.1

2008

7.3

1998

7.0

2008

7.3

2006

6.2

2024

4.5

1967

7.3

2007

6.5

2003

5.0

2004

6.8

1985

6.9

2009

5.6

2006

7.0

2006

4.8

2012

7.6

2011

1.0

2007

5.3

2006

4.8