2001

6.0

1999

6.2

2000

4.7

1996

5.7

1999

6.1

1962

1.0

2006

6.8

1997

0.0

1934

7.8

1994

5.2

1988

6.2

1999

5.9

1996

6.9

1994

5.5

1996

5.8

1998

6.0

1992

6.3

2003

6.3

2008

6.4

1932

4.5