----just a link to the website or publish some figures here that can be verifiable
OZ,
Without wanting to sound smart---s, NTSB/ATSB raw data and set to work, including reviewing the ATSB report already mentioned. See if you can get the minutes of ACF meetings over recent years (by whatever name it went by at the time). McCormick wasn't shooting in the dark.
One has to be careful, one relatively recent "publication" claimed "comparable" traffic counts between YSSY-YMML and the reference route in US. When we looked a little further, the US route a five times the traffic count. I wish my bank manager would accept the proposition that five time over my OD limit was "comparable" with my limit.
Likewise, another Australian produced report on en-route mid-airs in US assumed airports were at or near MSL, all the "en-route" mid airs in the US mid-west were, in fact, collisions in the circuit or arrival/departure areas of airports, even though they were 7000' +/-or so amsl.
Start from the raw data, fortunately mid-airs are relatively rare, this is not too onerous a task.
Tootle pip!!
PS: A tip, the US operating hours/sector operated are good to something like +/- 2%, ours are far more rubbery. Rubbery to the degree that you need to do rates at the limits of the Australian data accuracy, it changes the results. Australia still comes out unfavorably, it is a matter of degree.