1940

6.2

1940

5.7

1944

5.6

1942

5.8

1981

4.2

2005

4.0

1956

4.5

1992

4.5

1966

5.8

1955

2.0

2002

4.9

2002

3.7

2001

4.3

1996

4.6

1997

4.7

2008

4.5

1972

6.3

1998

3.8

1995

5.9

2003

4.8