You're looking at arrest data, not incident data. Very likely arrests are down because police deprioritized non-felony crimes post prop 47.

And then the bar of criminal charges for theft is getting higher and higher. In San Francisco nobody is getting bothered by a "criminal according to old stat rules" going through a row of parked cars smashing windows and grabbing everything in plain sight anymore. Not even arrest record would show up in modern stats. We are totally safe these days