-59.51% is the change from 815 to 330
Calculation steps:
[( 330 - 815 ) ÷ 815] x 100 = -59.51%
Formula
Percentage change = [(330 - 815) / 815] x 100
Subtract the new number by the original number
330 - 815 = -485
-485 ÷ 815 = -0.5950920245398773
-0.5950920245398773 x 100 = -59.51%