-47.2% is the change from 964 to 509
Calculation steps:
[( 509 - 964 ) ÷ 964] x 100 = -47.2%
Formula
Percentage change = [(509 - 964) / 964] x 100
Subtract the new number by the original number
509 - 964 = -455
-455 ÷ 964 = -0.47199170124481327
-0.47199170124481327 x 100 = -47.2%