-80.9% is the change from 267 to 51
Calculation steps:
[( 51 - 267 ) ÷ 267] x 100 = -80.9%
Formula
Percentage change = [(51 - 267) / 267] x 100
Subtract the new number by the original number
51 - 267 = -216
-216 ÷ 267 = -0.8089887640449438
-0.8089887640449438 x 100 = -80.9%