-39.7% is the change from 670 to 404
Calculation steps:
[( 404 - 670 ) ÷ 670] x 100 = -39.7%
Formula
Percentage change = [(404 - 670) / 670] x 100
Subtract the new number by the original number
404 - 670 = -266
-266 ÷ 670 = -0.3970149253731343
-0.3970149253731343 x 100 = -39.7%