-29.66% is the change from 917 to 645
Calculation steps:
[( 645 - 917 ) ÷ 917] x 100 = -29.66%
Formula
Percentage change = [(645 - 917) / 917] x 100
Subtract the new number by the original number
645 - 917 = -272
-272 ÷ 917 = -0.2966194111232279
-0.2966194111232279 x 100 = -29.66%