The Economist provides a graphic:
I understand the need to deploy a blockade to prevent serious weaponry getting in to Hamas. But when you look at the full range of blockaded goods, you realize that this is a de facto act of collective punishment, depriving Gazans of the ability to feed themselves, rebuild their shattered infrastructure, or construct a functioning state. Has it weakened Hamas' grip? Not so far as one can tell.
In fact, if you'd contrived to give Hamas a real, deep advantage, you could do far worse than Netanyahu's incompetence and rigidity. Fred Kaplan explains how lucky Hamas is to have such a clueless enemy here.