-36.3% is the change from 1000 to 637
Calculation steps:
[( 637 - 1000 ) ÷ 1000] x 100 = -36.3%
Formula
Percentage change = [(637 - 1000) / 1000] x 100
Subtract the new number by the original number
637 - 1000 = -363
-363 ÷ 1000 = -0.363
-0.363 x 100 = -36.3%