-60.81% is the change from 666 to 261
Calculation steps:
[( 261 - 666 ) ÷ 666] x 100 = -60.81%
Formula
Percentage change = [(261 - 666) / 666] x 100
Subtract the new number by the original number
261 - 666 = -405
-405 ÷ 666 = -0.6081081081081081
-0.6081081081081081 x 100 = -60.81%