This script puts a lot of information at your fingertips, and gives you the ability to format it so it suits you best. I chose to get rid of dates and simply show how many days a referral has been with me, and I could have displayed how many days, hours, and minutes since I rented them. Similarly, I chose to show how many days since the last click - eliminating the dates in both cases gives me a nice, clean, easy to read table of referrals.
This script also shows a 10 day average and a 7 day average for each referral, so you can get a sense for whether they're picking up steam or falling off. It also offers a standard deviation and ratio of standard deviation to average for those who like to probe into the referrals' statistics more. Check it out.