6.35% is the change from 866 to 921
Calculation steps:
[( 921 - 866 ) ÷ 866] x 100 = 6.35%
Formula
Percentage change = [(921 - 866) / 866] x 100
Subtract the new number by the original number
921 - 866 = 55
55 ÷ 866 = 0.06351039260969978
0.06351039260969978 x 100 = 6.35%