So, I usually click on my posts after I write them to check out the running tally of total blogs here on funny or die, via the permalink assigned to my blog. I've realized that the site does not reuse permalinks if a blog is deleted. I came to this conclusion, as my previous two posts were 150 and 151 respectively, and my post last night is post 146. However, 147-149 are not found on the server, and so must have been deleted by their authors.
So, unless I get bored enough to check EVERY permalink precededing mine... which is possible... There's no way of knowing exactly how many actual entries exist, and what percentage mine comprise. My current calculations say 5.5%, but with this revelation, I know it is actually a higher number, and that's good enough for me.