-10.61% is the change from 660 to 590
Calculation steps:
[( 590 - 660 ) ÷ 660] x 100 = -10.61%
Formula
Percentage change = [(590 - 660) / 660] x 100
Subtract the new number by the original number
590 - 660 = -70
-70 ÷ 660 = -0.10606060606060606
-0.10606060606060606 x 100 = -10.61%