-77.91% is the change from 670 to 148
Calculation steps:
[( 148 - 670 ) ÷ 670] x 100 = -77.91%
Formula
Percentage change = [(148 - 670) / 670] x 100
Subtract the new number by the original number
148 - 670 = -522
-522 ÷ 670 = -0.7791044776119403
-0.7791044776119403 x 100 = -77.91%