-24.33% is the change from 670 to 507
Calculation steps:
[( 507 - 670 ) ÷ 670] x 100 = -24.33%
Formula
Percentage change = [(507 - 670) / 670] x 100
Subtract the new number by the original number
507 - 670 = -163
-163 ÷ 670 = -0.24328358208955222
-0.24328358208955222 x 100 = -24.33%