|  | Period |  |
---|---|---|---|
Month | 1979-89 | 1990-2000 | 2001-2011 |
January | 0.91 | 0.73 | 0.73 |
February | 1.22 | 1.03 | 1.05 |
March | 1.24 | 1.10 | 1.06 |
April | 0.91 | 0.73 | 0.71 |
May | 0.34 | 0.27 | 0.29 |
June | 0.11 | 0.11 | 0.10 |
July | 0 | 0 | 0 |
August | 0 | 0 | 0 |
September | 0 | 0 | 0 |
October | 0.05 | 0.05 | 0.04 |
November | 0.08 | 0.08 | 0.06 |
December | 0.35 | 0.36 | 0.30 |
All Year | 0.44 | 0.37 | 0.36 |