-78.03% is the change from 660 to 145
Calculation steps:
[( 145 - 660 ) ÷ 660] x 100 = -78.03%
Formula
Percentage change = [(145 - 660) / 660] x 100
Subtract the new number by the original number
145 - 660 = -515
-515 ÷ 660 = -0.7803030303030303
-0.7803030303030303 x 100 = -78.03%