1947

7.3

2008

3.8

2003

5.7

1994

5.4

1998

2.9

1992

5.3

2008

5.6

1962

6.4

1986

7.0

2005

6.0

2001

3.2

1965

6.2

1955

7.3

2001

6.8

2005

6.2

2000

6.2

2006

5.5

1999

1.0

1956

6.2

1959

6.7