That link shows the majority of the drops happening under Giuliani’s watch and increasing during the late 90’s. Also, if you compare the performance over time compared to other cities, NYC improved more than other cities, and by 2001, while other cities like chicago and San Diego were experiencing resurgence in crime, NYC continued to see crime drop.
Credit due to Giuliani.
Giuliani did not get the ball rolling with respect to crime rates, as so many try to claim. Those are merely lies.