-51.15% is the change from 997 to 487
Calculation steps:
[( 487 - 997 ) ÷ 997] x 100 = -51.15%
Formula
Percentage change = [(487 - 997) / 997] x 100
Subtract the new number by the original number
487 - 997 = -510
-510 ÷ 997 = -0.5115346038114343
-0.5115346038114343 x 100 = -51.15%