1991

0.0

2003

7.4

2006

5.2

1959

5.8

1999

8.3

1994

3.0

1983

8.1

2004

6.2

2005

6.2

2000

8.2

2003

7.7

1991

6.6

2001

7.5

1991

7.8

1961

5.0

2000

7.5

2005

8.0

2004

7.2

1992

6.7

2001

5.8