-62.67% is the change from 817 to 305
Calculation steps:
[( 305 - 817 ) ÷ 817] x 100 = -62.67%
Formula
Percentage change = [(305 - 817) / 817] x 100
Subtract the new number by the original number
305 - 817 = -512
-512 ÷ 817 = -0.6266829865361077
-0.6266829865361077 x 100 = -62.67%