The percentages displayed in your individual data refer to each respondent's questionnaire completion rates.
A percentage of 1 to 99% means that your respondent did not complete the questionnaire.
If the percentage is 100%, it means that the respondent completed your questionnaire.
Note : Even if you have a 100% completion rate, your respondent may not have answered all the questions. It simply means that he clicked on the "End" button.