In case you're interested, Israeli-Palestinian Fatalities Since 2000 - Key Trends*.
There are several reasons why there are more Palestinian casualties than Israeli ones, despite the fact that Palestinian terrorists directly target Israeli civilians as a matter of routine, while the IDF never directly targets civilians.
1) Israel protects its civilians. In Israel like in most sane countries, military resources/bases/forces are kept
away from civilian concentrations. Also, the security wall built between Israel and the territories prevented many suicide bombing attacks which saved many lives. Furthermore in the last conflict with Gaza simple means such as bomb shelters and warning sirens saved many lives.
2) Hamas have absolutely zero regard for human life.
a) Hamas make cynical use of Gazan population as human shields, as a fighting strategy.
b) Hamas, to this day, have done absolutely zero to protect the Gazan population in any aspect. They're big on accusing Israel for everything, but when it comes to actually doing something to protect the population their achievement list is ZERO. It's as if they
want lots of innocents to die so they can make Israel look bad in the media.
3) Israeli security forces are constantly getting better at preventing terrorist attacks on Israeli civilians. In the early 2000s all it took was one crazy "martyr" wearing an explosive belt to blow up a bus and kill dozens of Israelis. But now they can't do it. The security wall keeps them out. Israeli counter-terrorism and intelligence thwart attacks before they happen.
4) The document you referenced mentions that there is much internal violence in Gaza, and adds these deaths to the statistics. "Internal violence" basically means Hamas thugs offing Gazan civilians on a regular basis, attempting to strengthen their rule by means of terror and intimidation. Surely De Eveel Isra-eelees aren't to blame for those too, are they?
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PS When I see a document subtitled "occupied Palestinian territory" I get the sense that it is not exactly a sincere and factual report, so I wouldn't take everything written there at face value.