-7.83% is the change from 664 to 612
Calculation steps:
[( 612 - 664 ) ÷ 664] x 100 = -7.83%
Formula
Percentage change = [(612 - 664) / 664] x 100
Subtract the new number by the original number
612 - 664 = -52
-52 ÷ 664 = -0.0783132530120482
-0.0783132530120482 x 100 = -7.83%