-33.64% is the change from 767 to 509
Calculation steps:
[( 509 - 767 ) ÷ 767] x 100 = -33.64%
Formula
Percentage change = [(509 - 767) / 767] x 100
Subtract the new number by the original number
509 - 767 = -258
-258 ÷ 767 = -0.3363754889178618
-0.3363754889178618 x 100 = -33.64%