-19.1% is the change from 665 to 538
Calculation steps:
[( 538 - 665 ) ÷ 665] x 100 = -19.1%
Formula
Percentage change = [(538 - 665) / 665] x 100
Subtract the new number by the original number
538 - 665 = -127
-127 ÷ 665 = -0.19097744360902255
-0.19097744360902255 x 100 = -19.1%