1990

5.7

2008

6.0

1995

6.7

1938

6.2

2001

5.9

1987

6.9

1997

6.1

1999

7.8

2004

7.8

2006

4.9

1951

6.5

2008

5.7

2005

6.7

1993

4.8

2007

7.4

2003

6.7

2008

5.8

2008

6.7

1988

7.1

2016

5.6