You can see a Distribution of Answers chart for each point in time. This relates to the number of times that each contact has answered that question in the survey (or had it answered for them)
Choose a 'Point In Time' to analyse
Press the 1st Time for each Contact
The dropdown list will show an option for each consecutive time that the question has been answered for or by a contact
Select the “Point in time” you want to analyse
The pie chart will adjust accordingly
Hide the ‘Never Tagged’ wedge and/or other wedges from the Pie Chart
In the Key section, select the title of the wedge you want to hide
It becomes grey in the key and that wedge of the chart becomes hidden