jecasc - 10:42 am on Jul 12, 2011 (gmt 0)
Your question got me thinking as I realized I was making an educated guess in my posting and did not have the actual figure. I wrote a script to check the data since 2004. In June 2004 (after 3 years in business) I had 65% new customers, 35% returning customers. In June 2011 the number is 70% returning, 30% new.
Which actually frightened me for a moment, since this could indicate I am no longer able to attract new customers. However the absolute numbers show that the amount of new customers is still increasing too - more slowly than at the beginning, but nevertheless.
So if you want to have accurate data you need not only compare the percentage new/returning customers but also check how the absolute numbers develop.
Quite an important figure - which actually totally escaped my notice until now, so thanks for the thought-provoking impulse.