-21.3% is the change from 770 to 606
Calculation steps:
[( 606 - 770 ) ÷ 770] x 100 = -21.3%
Formula
Percentage change = [(606 - 770) / 770] x 100
Subtract the new number by the original number
606 - 770 = -164
-164 ÷ 770 = -0.21298701298701297
-0.21298701298701297 x 100 = -21.3%