21.   Retailers are ranked according to year-to-date results as of the end of March.

22.   Retailers are ranked according to year-to-date results as of the end of May.

23.   Retailers are ranked according to year-to-date results as of the end of November.

24.   The states are ranked according to their composite score.

25.   They were also ranked according to research output, average annual teaching pay and benefits.