2005

7.8

2009

7.1

2006

5.5

1980

4.3

1978

2.0

1978

4.7

1997

3.8

2006

7.4

1932

6.9

1995

7.0

1966

8.0

2002

7.2

2001

6.2

1972

7.1

2001

7.4

1997

6.9

1962

8.0

1998

6.4

1974

7.9

1985

7.7