2007

2.7

1970

4.3

1999

3.6

1991

4.0

1977

0.0

1999

4.9

2003

5.7

1997

6.0

1957

7.0

2000

5.6

1984

5.6

1971

2.0

2001

0.0

1990

6.9

1955

6.0

1975

5.7