-86.51% is the change from 378 to 51
Calculation steps:
[( 51 - 378 ) ÷ 378] x 100 = -86.51%
Formula
Percentage change = [(51 - 378) / 378] x 100
Subtract the new number by the original number
51 - 378 = -327
-327 ÷ 378 = -0.8650793650793651
-0.8650793650793651 x 100 = -86.51%