2000

6.7

2002

5.2

2010

6.2

2008

5.1

1961

7.2

2004

6.7

1990

6.1

2003

5.5

1979

6.8

2017

6.0

1997

5.4

1998

6.0

1993

6.4

2009

5.6

1943

7.5

2006

5.4

2009

6.1

2005

6.8

2007

6.0

2010

6.8