Was that price change overnight? Like its $14 today, and last week it was only $5?
I'd find it very hard to believe that a change of $9 at a shit sandwich shop would happen overnight. But lets call it $2 per year, that means it was from 2020 and that doesn't make sense either.
Lets call it $1 a year, with a covid bump in 2019. That would be from ~2016, with a bump in 2019, and assuming that this year is not included since you have not completed you fiscal year yet in the US. So that is a change over 8 years.