1946

7.5

2003

6.1

1987

7.3

2000

6.3

1999

6.8

2004

6.1

2006

6.6

1980

6.6

1982

6.4

2001

7.9

1994

6.8

1946

7.7

2001

6.7

2000

6.7

1983

6.5

1974

6.4

2005

5.7

1989

6.6

1941

7.2

2004

6.0