1990

6.9

2001

7.3

2003

7.1

2002

7.1

2004

6.3

1969

0.0

1995

0.0

1942

7.5

2007

6.9

1997

6.0

1959

4.2

2004

6.8

1991

6.4

1969

6.6

1973

3.5

2005

6.2

1974

5.0

2000

6.4

1994

7.0

2006

8.2