-84.98% is the change from 606 to 91
Calculation steps:
[( 91 - 606 ) ÷ 606] x 100 = -84.98%
Formula
Percentage change = [(91 - 606) / 606] x 100
Subtract the new number by the original number
91 - 606 = -515
-515 ÷ 606 = -0.8498349834983498
-0.8498349834983498 x 100 = -84.98%