help on a Do loop that doesn't work

I have big data file on excel, the file has 6930 rows and 8 columns, the 8 column has percents (0%, 4%, 16%, 18%, 19% and etc..)
I tried to do a macro that paint all the rows that the percent in the end of their row are bigger then 18%, and it doesn't work,
I would like to get some ideas how to make it work, Thanks in advance.

The file start from row 3, so rows 1 and 2 are empty The macro:

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Also cross-posted: http://stackoverflow.com/questions/2...-big-data-file