1996

7.3

2000

7.5

1999

6.8

1992

7.7

2001

7.5

1993

6.7

2005

6.9

1997

7.9

2019

7.5

1931

8.3

1989

7.8

1925

8.0

2002

7.2

1994

7.0

2006

7.1

2006

7.3

2006

6.8

2007

0.0

1983

7.8

2007

4.5