-29.21% is the change from 938 to 664
Calculation steps:
[( 664 - 938 ) ÷ 938] x 100 = -29.21%
Formula
Percentage change = [(664 - 938) / 938] x 100
Subtract the new number by the original number
664 - 938 = -274
-274 ÷ 938 = -0.2921108742004264
-0.2921108742004264 x 100 = -29.21%