1965

6.2

2003

5.7

2008

3.8

1955

7.3

1947

7.3

1994

5.4

2004

6.7

2002

6.2

2005

6.2

1986

7.0

2005

6.0

2001

3.2

2006

5.5

2001

6.8

2000

6.2

1952

7.3

1988

4.3

2004

5.4

1959

6.7

1956

6.2