In the Audience growth section of your Instagram Audience report, you can visualize how big your audience is and whether it is growing. You have the option to see a visual overview of your followers by Variation or Total. Hovering your mouse over the graph line allows for further insight into the results for a specific day.
Note: Total Follower count is only available if you have at least 100 followers (source).
Audience Growth by Variation
If Graph display is set to Variation, you can see how many followers were lost and gained for your account on a daily interval (in relation to your selected date range).
Below the visual, you will see how many followers were lost/gained, the net follower growth for the period (Total added), the total amount of followers and the overall follower variation % in relation to your selected comparison period.
Audience Growth by Total
If Graph display is set to Total, you can visualize how the total amount of followers for your account has changed throughout the selected date range on a daily interval.
Below the visual, you will see how many followers were lost/gained, the net follower growth for the period (Total added), the total amount of followers and the overall follower variation % in relation to your selected comparison period.