-49.15% is the change from 997 to 507
Calculation steps:
[( 507 - 997 ) ÷ 997] x 100 = -49.15%
Formula
Percentage change = [(507 - 997) / 997] x 100
Subtract the new number by the original number
507 - 997 = -490
-490 ÷ 997 = -0.49147442326980945
-0.49147442326980945 x 100 = -49.15%