-65.93% is the change from 637 to 217
Calculation steps:
[( 217 - 637 ) ÷ 637] x 100 = -65.93%
Formula
Percentage change = [(217 - 637) / 637] x 100
Subtract the new number by the original number
217 - 637 = -420
-420 ÷ 637 = -0.6593406593406593
-0.6593406593406593 x 100 = -65.93%