Again, this is the same data that you already showed in the two tables. A line chart is a fine way to show it, but it would be more effective -- and more accurate -- if you included all of the races in single chart with multiple lines, rather than splitting them up into separate chart. That way, the audience would able to see the trends, not just within each group, but in comparison to other groups.
Also, you're getting into dubious journalistic territory in the three minority representation line charts. When you confine the numbers in the Y axis to a narrow range (e.g, 3.5 to 6.5 percent), that skews the visual and makes small changes seem large. We talked about that problem in class. The Hispanic representation chart, for example, only changes one percent from 2008 to 2015, and the black representation chart hardly changes at all; just a one-percent blip downward in one category in 2011. But with such a small Y range, the charts make the changes look large. Please let me know if you're uncertain about this. You need to fix this before putting it in your portfolio.
I would also consider a stacked bar chart instead a line chart for this dataset.