-29.6% is the change from 919 to 647
Calculation steps:
[( 647 - 919 ) ÷ 919] x 100 = -29.6%
Formula
Percentage change = [(647 - 919) / 919] x 100
Subtract the new number by the original number
647 - 919 = -272
-272 ÷ 919 = -0.2959738846572361
-0.2959738846572361 x 100 = -29.6%