Natural immunity

[vhscom]

I noticed there's a chart on the site called "Herd immunity". The ledgend for that chart contains a key named "Total fully vaccinated" and no other legend items. Should this not also contain those who are naturally immune? I'd wager when you add the two together the result would be about 100%. Then if that same chart were flipped upsidedown I think we'd get a better understanding of how natural immunity to coronaviruses has been decreasing over the last two years.