-29.1% is the change from 938 to 665
Calculation steps:
[( 665 - 938 ) ÷ 938] x 100 = -29.1%
Formula
Percentage change = [(665 - 938) / 938] x 100
Subtract the new number by the original number
665 - 938 = -273
-273 ÷ 938 = -0.291044776119403
-0.291044776119403 x 100 = -29.1%