1998

6.0

1982

6.9

2005

6.1

1996

6.7

2002

5.8

2008

5.7

2006

5.5

2007

6.8

1998

5.7

2010

5.6

1995

5.9

2013

5.7

2010

5.6

2007

7.2

2012

6.0

2013

5.7

1938

7.5

2008

6.8

1982

6.2

1999

6.0