-30.36% is the change from 929 to 647
Calculation steps:
[( 647 - 929 ) ÷ 929] x 100 = -30.36%
Formula
Percentage change = [(647 - 929) / 929] x 100
Subtract the new number by the original number
647 - 929 = -282
-282 ÷ 929 = -0.30355220667384286
-0.30355220667384286 x 100 = -30.36%