-36.5% is the change from 1000 to 635
Calculation steps:
[( 635 - 1000 ) ÷ 1000] x 100 = -36.5%
Formula
Percentage change = [(635 - 1000) / 1000] x 100
Subtract the new number by the original number
635 - 1000 = -365
-365 ÷ 1000 = -0.365
-0.365 x 100 = -36.5%