Takes a data.frame and a specified field, calculates the percentage of that field each value represents, and then appends that to the data.frame
| 1 | percentage(x, field, for_writing = TRUE)
 | 
| x | a data.frame | 
| field | the name of a field to generate the percentages of. | 
| for_writing | whether the percentages are for writing out and consumption by the public (1.03 to TRUE by default. | 
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