-91.36% is the change from 521 to 45
Calculation steps:
[( 45 - 521 ) ÷ 521] x 100 = -91.36%
Formula
Percentage change = [(45 - 521) / 521] x 100
Subtract the new number by the original number
45 - 521 = -476
-476 ÷ 521 = -0.9136276391554703
-0.9136276391554703 x 100 = -91.36%