-48.75% is the change from 997 to 511
Calculation steps:
[( 511 - 997 ) ÷ 997] x 100 = -48.75%
Formula
Percentage change = [(511 - 997) / 997] x 100
Subtract the new number by the original number
511 - 997 = -486
-486 ÷ 997 = -0.48746238716148443
-0.48746238716148443 x 100 = -48.75%