Add ability to show n-size (sample size) on charts and graphs

Add the ability to show sample sizes in charts. For example, if I had a chart showing the average employee engagement score by ethnicity, add the ability to show the number of records that contribute to each aggregate score.

Additionally, it would be helpful to have the option to exclude categories with small sample sizes (for example, if there were only two respondents to the survey who identify as a certain demographic, then do not display an average for that demographic to preserve their anonymity).