-36.6% is the change from 1000 to 634
Calculation steps:
[( 634 - 1000 ) ÷ 1000] x 100 = -36.6%
Formula
Percentage change = [(634 - 1000) / 1000] x 100
Subtract the new number by the original number
634 - 1000 = -366
-366 ÷ 1000 = -0.366
-0.366 x 100 = -36.6%