-89.7% is the change from 670 to 69
Calculation steps:
[( 69 - 670 ) ÷ 670] x 100 = -89.7%
Formula
Percentage change = [(69 - 670) / 670] x 100
Subtract the new number by the original number
69 - 670 = -601
-601 ÷ 670 = -0.8970149253731343
-0.8970149253731343 x 100 = -89.7%