My Qassam numbers are very low

The IDF just announced that since Hamas' takeover in Gaza there have been about 350 rocket attacks and 650 mortar attacks against Israel. My count of Qassam rockets, looking only at articles I happen to catch in the Israeli press, is roughly half this number in that time period. Which means that not only do Israelis have to worry about rockets coming at the rate of nearly 3 a day, but also that the attacks happen so often that many do not even get into the news.