2.49% is the change from 845 to 866
Calculation steps:
[( 866 - 845 ) ÷ 845] x 100 = 2.49%
Formula
Percentage change = [(866 - 845) / 845] x 100
Subtract the new number by the original number
866 - 845 = 21
21 ÷ 845 = 0.02485207100591716
0.02485207100591716 x 100 = 2.49%