> Everything also got digitized in that time which is somewhat of a confounding factor. The IRS being a large federal agency, it's possible that everything exc

> Everything also got digitized in that time which is somewhat of a confounding factor. The IRS being a large federal agency, it's possible that everything except the IRS got digitized... Or, you know, the IRS "got digitized". In the 90s / 00s -- so, with humongously clunky systems built by huge consulting firms to the standards of (at least) ten years earlier.