-78.85% is the change from 312 to 66
Calculation steps:
[( 66 - 312 ) ÷ 312] x 100 = -78.85%
Formula
Percentage change = [(66 - 312) / 312] x 100
Subtract the new number by the original number
66 - 312 = -246
-246 ÷ 312 = -0.7884615384615384
-0.7884615384615384 x 100 = -78.85%