2004

6.9

1974

5.7

2016

5.6

2001

5.1

2005

6.0

1996

6.0

1981

6.7

1986

7.0

2003

6.3

1954

6.8

1955

6.5

2006

6.4

2004

7.7

1992

4.7

2010

2.2

2005

7.0

2008

6.7

2007

5.9

1998

5.8

1991

6.3