What's the APR on BETH?

Hello everybody,

I am trying to understand what's the APR in Binance for BETH.
I got a spreadsheet where I write the amount of BETH for each day but I am unsure about the results...
I usually take a 3 days difference between the values, such that the time at which I take the value does not have much impact, and then I do some math:

(Difference (at 3 days) / 3 ) *365 / (Beth Value (3 days before) )

If I do that I get values around 0.04 or 0.05, which is 4 to 5% APR.
But wasn't Binance supposed to give around 7% ?
Does anyone know what's the APR?