66.4% is the change from 503 to 837
Calculation steps:
[( 837 - 503 ) ÷ 503] x 100 = 66.4%
Formula
Percentage change = [(837 - 503) / 503] x 100
Subtract the new number by the original number
837 - 503 = 334
334 ÷ 503 = 0.6640159045725647
0.6640159045725647 x 100 = 66.4%