-21.04% is the change from 670 to 529
Calculation steps:
[( 529 - 670 ) ÷ 670] x 100 = -21.04%
Formula
Percentage change = [(529 - 670) / 670] x 100
Subtract the new number by the original number
529 - 670 = -141
-141 ÷ 670 = -0.21044776119402986
-0.21044776119402986 x 100 = -21.04%