"That would be a 6 month time period, where the number of cars went from 58,295 to 64,500. A total change of 6,205 new cars over 6 months amounts to roughly 1,000 new for-hire vehicles a month - about one half of the rate that de Blasio had said in his OpEd."
This argument assumes (with no justification) that the cars have been added at a constant rate. But if they were being added at an increasing rate, there might have indeed been 2000 cars a month added over the last two or three months (with less than a thousand added in previous months), and the mayor may have been citing the most recent statistics rather than a yearly average. Without more reliable data, there's no way to know which is true.
This argument assumes (with no justification) that the cars have been added at a constant rate. But if they were being added at an increasing rate, there might have indeed been 2000 cars a month added over the last two or three months (with less than a thousand added in previous months), and the mayor may have been citing the most recent statistics rather than a yearly average. Without more reliable data, there's no way to know which is true.