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Codes and Frequencies



An 'X' indicates the category is available for that sample

00NIUXXXX
01JanuaryXXXX
02FebruaryXXXX
03MarchXXXX
04AprilXXXX
05MayXXXX
06JuneXXXX
07JulyXXXX
08AugustXXXX
09SeptemberXXXX
10OctoberXXXX
11NovemberXXXX
12DecemberXXXX
96Time period formatXXXX
97Unknown-refusedXXXX
98Unknown-not ascertainedX··X
99Unknown-don't knowXXXX