Frequency of RVC Replacements

I'm feverishly working to finish up my background paper regarding RVC replacement solutions. Here's one of the bits of data I dug up:

Out of 88 RVC terms (Region 10 was added in 2000) since 1995, there have been 10 mid-term vacancies. Of those, 5 left office before the first year was over.

Ignoring the term that just started this summer, in the past 15 years, just over 6% of RVC have needed to be replaced within 12 months. Nearly 13% have needed to be replaced at some point during the two-year term.