Nested Data Axis Labels

R

ratpha

Data used to construct pivot table chart:
x axis: number of people attending a course broken down by 4 role types
y axis: colleges that people are from showing a different bar for each year
(two different years)

Problem: The x axis labels display vertically (wrapped) and I can't find a
way to rotate them. It looks really messy and is very difficult to read.
 
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