As Web of Science is not having the scope to analyze more than 10000 data at a time, to cover the period of 50 years I have generated 10 Citation Reports splitting into 5 years for each institution. Now I like to know how I will compare research performance of 5 institutions during 50 years. Will the citation data on every 5 years will be compared with the data of other institution during the same time span or there may be any other best way. Kindly help me to understand with example