Choosing test for dependent anonymous sample comparisons


New Member
I have data collected each year from 2010-2015. In this data I have demographic information and a self-reported score on a 5 pt Likert scale. The surveys were anonymous but I know that many of the same people were surveyed each year.
I would like to compare the self-reported score across years but I'm having trouble choosing what statistical test is appropriate. I am unable to work with difference scores as the survey was anonymous.
Any advice would be greatly appreciated!