Wendy makes some good points.
RSL's and MARD's have definitely helped. Note that every year we record fatalities that would likely not have happened if the jumper used an RSL or MARD. There are jumpers who remain steadfast to their opinion that these devices are dangerous, but the data says otherwise by a big margin.
More and better canopy training has been very effective in lowering our canopy injuries and fatalities by number, although the overall percentage of canopy-related fatalities each year has remained about the same for quite a while. About 50% of our annual fatalities come from flying parachutes into the ground, either from intentional low turns (swooping) or unintentional low turns (confusion, mis-judging recovery altitude, avoidance turns, etc.). By the way, the vast majority of intentional turn canopy fatalities involve male jumpers with less than 1,000 jumps and rapid downsizing. That pattern will only change when we change it.
Better training doctrine and techniques have been effective. Drop zones take ongoing training more seriously than in the past, as do most jumpers. Students graduate from training programs with better skill sets these days and that leads to fewer mistakes. The same holds true with more and better information.
I do think our changing demographic has contributed to better numbers. Skydivers are older on average than in the past, and that has probably led to fewer poor, testosterone-fueled decisions. Same goes for income. We are wealthier on average than we were years ago so more jumpers can afford state-of-the-art gear, audibles, training courses, etc. They can also afford to maintain their gear better - fewer mals means fewer EP errors.
Looking at just about every calendar year, we are losing the bulk of our jumpers from the same causes.
Flying fast canopies with too much ego and too little training
Failing to utilize equipment that will save us when we can't or won't
Performing EP's improperly or too slowly
Not following landing priorities
Just my 2 cents
#projectzero