To facilitate current discussions, we would like to find out how the average quality of new article submissions has changed over time on English Wikipedia. We know that roughly ~25,000 new mainspace pages are created each month on Enwiki, but we don't have a good idea of how many of those actually survive. We suspect that the percentage of new articles that are eventually deleted has increased over the years, but we don't have any actual evidence of this or idea how significant the increase has been. Note that we're mainly interested in the percentage here, not the total numbers, but total numbers would be a nice bonus :) Ideally the chart should include all years from 2001 to the present. We realize there will be a strong bias for survival within the most recent month or two (since these articles may not yet be reviewed), so you can leave off the most recent month or two if that makes more sense.
If possible, we'd like to know the answer within the next week or two, for ongoing discussions. Thanks.