Let’s make some reasonable assumptions. Having observed the number of jumps they process through their jump center, I’d say they they do 10 flights per day with a dozen jumpers per flight. On weekends they get in more, often four flights in an hour. Some with tandem jumpers. Let’s assume that they’ve been able to get in approximately 120 jumps per day, times seven five week days plus 200 jumps for Saturday and Sunday. That comes to 600 during the week plus 400 weekend jumps, for 1000 a week.
There are 52 weeks a year, but not all weeks are jumpable nor all all days. So lets assume that 40 weeks a year are suitable jumping weeks combining days/weeks are good for jumping considering weather, holidays, etc. Then we know the center opened in the early 1980s, so lets assume 37 years of operation. So, our formula to learn the number of jumps is ~1000 X ~40 weeks X ~37 years = ~1,480,000 jumps.
We divide that by the known 19 fatalities in the ~37 years to get the number of deaths per year. ~1,480,000 / 19 = approximately 1 fatality per ~78,000 parachute jumps.
So, it looks as if there is about a ~22% higher chance of dying in a jump at the Lodi Jump Center than in the National Average of 1 in 100,000.
Of course, that is assuming that the numbers used to calculate the national average are correct. I am not sure there is any registry of exactly how many jumps are made each year. Also, does that include civilian and military and are there statistical difference between the populations.