1947

6.6

2004

3.8

1992

6.2

1967

5.8

1972

4.0

2001

1.0

1996

5.5

2005

0.0

2007

5.0

1995

6.1

1988

5.7

1967

5.3

1967

0.0

1977

6.0

1988

5.7

2005

6.7

1967

6.6

1964

6.1

2001

5.9

1993

6.0