For the whole dataset I got 1857 victims and 1006 abusers. This calculates to an ratio of 1.85 victims per abuser.
I'm curious as to this ratio for the 10 year data slice you have extracted, as it appears from the figures you've produced that the ratio will be lower for the latter 10 years than for the dataset as a whole - which would suggest there's a downward trend.
Also if you can separately determine the ratio for the period prior to 2005 we can absolutely confirm if there is a downward trend.
My data slice does take a look at each year and I noticed that 2005 has a significantly higher incidence rate than other years in the 10-year period. (This is one reason why I presented an extrapolation based on a 10-year average rather than any single year.) Before I finalize anything for wider use I'm thinking about removing the highest and lowest incident years to form a more conservative extrapolation. But before I do that I want to analyze the data more to see if i can identify why some years might have lower or higher numbers. There are instructions to elders over the last 25 years or so that might have driven some of what we find in the numbers. One reason why I selected the 10-year period of 2005-2014 was to avoid some years (by a fairly wide margin) where numbers could easily be skewed either upward or downward for reasons of fluctuating Watchtower policy instructions to elders. What I've presented here is just a beginning.