-64.11% is the change from 861 to 309
Calculation steps:
[( 309 - 861 ) ÷ 861] x 100 = -64.11%
Formula
Percentage change = [(309 - 861) / 861] x 100
Subtract the new number by the original number
309 - 861 = -552
-552 ÷ 861 = -0.6411149825783972
-0.6411149825783972 x 100 = -64.11%