1969

6.6

1934

5.5

2000

7.4

2004

5.2

2006

4.7

2004

5.6

1941

7.0

1980

4.8

1964

6.3

2010

3.8

1987

4.5

2009

5.6

2000

6.3

1987

4.2

2004

6.8

2005

6.2

2006

6.4

1989

5.4

1998

6.9

2004

4.1