If you want an analysis for all the years between 2000 and 2009, then you are probably looking for a research paper, and this is not really the place.
Anyway, in construction project, here is the formula:
- When the time increases, the cost of the project will increase, because you will have workers working more days and you may run into some penalties for finishing late.
- When the time decreases, then this means that we are working faster than usual (maybe adding extra labor, renting more equipment), then also the costs will increase.