What is the lowest interest rate in mortgage history?

What is the lowest interest rate in mortgage history?
Added (1). I know loan rates depend on a myriad of factors but lets look at best case scenario. Given all ideal conditions. For someone with perfect credit, a huge down payment, etc. Etc. (Obviously not that realistic)

What is the lowest loan rate a bank would possible give them?

is a 2% rate impossible? The lowest I have seen is 3%

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