If you go to Admin > Reports > Customers > New, and just click Refresh, it appears to show all dates from 1/1/01 to present.
It shows a row for each date, whether or not there is data for this date. Since I only have one customer record:
it is showing me 5477 unneeded rows. I believe this page would render a lot quicker and be easier to read if it just showed you the rows that have data. It may also be a good idea to default the "Refresh" button to a tighter time span, such as YTD.