-49.75% is the change from 611 to 307
Calculation steps:
[( 307 - 611 ) ÷ 611] x 100 = -49.75%
Formula
Percentage change = [(307 - 611) / 611] x 100
Subtract the new number by the original number
307 - 611 = -304
-304 ÷ 611 = -0.49754500818330605
-0.49754500818330605 x 100 = -49.75%