While a pie chart may be the best way to represent fractional data, a pie chart with 10 segments and four shades of grey is not. A better method would have been

While a pie chart may be the best way to represent fractional data, a pie chart with 10 segments and four shades of grey is not. A better method would have been to include only significant results, coupled with an "Other" category, in the chart. A separate data table could then inform those interested in delving deeper into the results.