1994

6.8

2004

5.6

1940

7.9

1996

5.4

2009

6.3

1998

6.8

1981

6.5

2006

5.2

2005

6.2

1991

6.5

1997

6.2

1999

7.4

2007

4.7

2014

3.6

1929

6.1

2001

7.5

2017

5.7

2014

5.5

1948

6.2

1925

7.5