2001

6.3

1994

6.4

1997

4.9

1973

6.8

2008

6.8

1999

5.8

2008

4.3

2006

5.8

2005

7.3

2003

7.0

1998

6.2

2008

5.2

1998

6.3

1974

5.1

2009

5.4

2009

5.9

2000

7.3

2008

5.9

2014

6.2

1993

6.0