At the beginning of 2020, there were 2268 Confederate symbols in the US (flags in government buildings, monuments, etc). About 92.6% of them were still up at the end of the year. How many were removed?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.