public String getExtensionFrequency() {
		Map<String, Integer> map = analytic.getExtensionFrequency();
		StringBuilder sb = new StringBuilder();
		
		List<Entry<String, Integer>> entries = new ArrayList<Entry<String, Integer>>(map.entrySet());
		Collections.sort(entries, new Comparator<Entry<String, Integer>>() {
		    public int compare(Entry<String, Integer> o1, Entry<String, Integer> o2) {
		     return o2.getValue() - o1.getValue();
		    }
		});
		
		for(Entry<String, Integer> extension : entries){
			sb.append(extension.getKey());
			sb.append(" - ");
			sb.append(extension.getValue());
			sb.append(NEWLINE);
		}
		return sb.toString();
	}