These are Greasemonkey userscripts for last.fm

Last.fm - Percentage

Adds play percentage for each track and artist in your charts. For weekly charts it is the percentage of plays that week, for overall charts it's of total plays.

The number of decimal places and the font color can be configured from the 'User Script Commands' - > 'Set Number of Decimal Places', 'Set Percentage Font Color'

Install Last.fm - Percentages

Last.fm Play Statistics!

Adds Play Statistics to users' profiles, namely Tracks per hour, day, week, month and year.

Install Last.fm Play Statistics