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How have police shootings' levels changed from 2010 to 2016 on unarmed subjects? and what is the percentage of subjects from each race? (in the 50 largest local police departments in the US.)

Races:
L: Latino
B: Black
W: White
A: Asian
O: Other
U: Unknown

Data:
The data was collected by VICE News who spent 9 months collecting data on police shootings from the 50 largest local police departments in the US.
https://news.vice.com/en_us/article/a3jjpa/nonfatal-police-shootings-data
The dataset can be downloaded from the following link:
https://docs.google.com/spreadsheets/d/1CaOQ7FUYsGFCHEqGzA2hlfj69sx3GE9GoJ40OcqI9KY/edit#gid=1271324584