66.36% is the change from 321 to 534
Calculation steps:
[( 534 - 321 ) ÷ 321] x 100 = 66.36%
Formula
Percentage change = [(534 - 321) / 321] x 100
Subtract the new number by the original number
534 - 321 = 213
213 ÷ 321 = 0.6635514018691588
0.6635514018691588 x 100 = 66.36%