-19.85% is the change from 670 to 537
Calculation steps:
[( 537 - 670 ) ÷ 670] x 100 = -19.85%
Formula
Percentage change = [(537 - 670) / 670] x 100
Subtract the new number by the original number
537 - 670 = -133
-133 ÷ 670 = -0.19850746268656716
-0.19850746268656716 x 100 = -19.85%