According to the Israeli Ynet news service, Palestinians in Gaza have fired 1000 mortar rounds and rockets at Israel since Hamas took power in June.
The IDF estimates that approximately 350 Qassam rockets and 650 mortar rounds have been launched at Israel since then. But, these numbers only represent launches that were recorded, so the actual numbers are likely higher.
For Israel’s military options on how to respond to the rockets, see this great piece by Mitchell Bard in the latest issue of inFocus.
For a terrific analysis of Israel’s other challenges vis-a-vis Gaza, see Richard Baehr’s inFocus piece, “Between the West Bank and a Hard Place.”