If not please rephrase your question.
Ok.
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.