-80.83% is the change from 266 to 51
Calculation steps:
[( 51 - 266 ) ÷ 266] x 100 = -80.83%
Formula
Percentage change = [(51 - 266) / 266] x 100
Subtract the new number by the original number
51 - 266 = -215
-215 ÷ 266 = -0.8082706766917294
-0.8082706766917294 x 100 = -80.83%