86.84% is the change from 509 to 951
Calculation steps:
[( 951 - 509 ) ÷ 509] x 100 = 86.84%
Formula
Percentage change = [(951 - 509) / 509] x 100
Subtract the new number by the original number
951 - 509 = 442
442 ÷ 509 = 0.8683693516699411
0.8683693516699411 x 100 = 86.84%