calculates a delta between X or Y (or sequential X values) expressed as a percentage.
1  | percent_change(x, y = NULL)
 | 
x | 
 a numeric vector  | 
y | 
 (optionally) an additional numeric vector. If y is not provided, each value in x will be compared to the subsequent value - if y is, each x value will be compared to the equivalent y value  | 
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