-78.2% is the change from 665 to 145
Calculation steps:
[( 145 - 665 ) ÷ 665] x 100 = -78.2%
Formula
Percentage change = [(145 - 665) / 665] x 100
Subtract the new number by the original number
145 - 665 = -520
-520 ÷ 665 = -0.7819548872180451
-0.7819548872180451 x 100 = -78.2%