gistfile1.js

$('aside.filter li').each(function() {
  var this_class = $(this).attr('class'),
      people_count = $('div#crew_list > div.'+this_class+' div.user').length,
      percentage = ((((people_count / $('div#crew_list div.user').length)*100)).toString()+'%');
  $(this)
    .css('width',percentage)
    .data('width',percentage)
    .find('span')
      .append(people_count);
});