-29.64% is the change from 307 to 216
Calculation steps:
[( 216 - 307 ) ÷ 307] x 100 = -29.64%
Formula
Percentage change = [(216 - 307) / 307] x 100
Subtract the new number by the original number
216 - 307 = -91
-91 ÷ 307 = -0.2964169381107492
-0.2964169381107492 x 100 = -29.64%