-31.02% is the change from 938 to 647
Calculation steps:
[( 647 - 938 ) ÷ 938] x 100 = -31.02%
Formula
Percentage change = [(647 - 938) / 938] x 100
Subtract the new number by the original number
647 - 938 = -291
-291 ÷ 938 = -0.31023454157782515
-0.31023454157782515 x 100 = -31.02%