I am able to get the bars to be different colors based on value by creating
one data series for positive numbers and another for negative values (for
each industry, each year has either a positive value and a missing negative
value, or a missing positive value and a negative value). This isn't hard
to do but perhaps there is a more elegant solution.
Where I am stumped is the quarter circle on the bottom right of each graph
sized according to the level of employment in the industry. Obviously it
would be easy to create a pie chart showing the proportions of employment by
industry and then the set of bar charts showing annual growth, but, in my
view, it looks nice having all that information in one display.
