Postgres mailing list volume as measured by size of the gzip compressed mbox

You can see the raw data with HTTP HEAD requests like this: HEAD http://archives.postgresql.org/pgsql-hackers/mbox/pgsql-hackers.2008-09.gz | grep Content-Length
The gzipped mbox size seems to me in some ways to be a better measure of mailing list volume than simple message counts because it better measures the information density of the lists; weighing large gzipped patches more than repetitive text. markmail's graphs