2013

0.0

1970

5.0

1995

4.8

2000

5.2

1991

4.9

1972

4.6

1962

5.6

1975

2.7

2007

5.4

2003

7.0

1967

3.9

1975

7.0

1960

6.2

1974

7.6

1980

6.3

1932

6.0

1974

5.4

1932

5.5