Agreed - I was dealing with the data and thought - "Hmm - HN might be interested in a graph of this" so I knocked one out quickly. The scales don't really matter. It covers from 2002 to 2010, and really there's not much else you need to know.

In case you want, the raw data are here:

http://www.solipsys.co.uk/new/RawSpamCount.html?HN

The first field is the number of emails, the last two are year and month. The others are meaningless.