-38.73% is the change from 834 to 511
Calculation steps:
[( 511 - 834 ) ÷ 834] x 100 = -38.73%
Formula
Percentage change = [(511 - 834) / 834] x 100
Subtract the new number by the original number
511 - 834 = -323
-323 ÷ 834 = -0.3872901678657074
-0.3872901678657074 x 100 = -38.73%