if strata_results_size > 0
                  body_row[index] = (include_html ? color_for_number((filtered_results.size.to_f / strata_results_size * 100), "#{(filtered_results.size.to_f / strata_results_size * 100).round(1)}%") : "#{(filtered_results.size.to_f / strata_results_size * 100).round(1)}%")
                else
                  body_row[index] = "---"