I've neglected the New Yorker Parity Report in the past several months. My only excuse is that the monotony was getting to me. During the time I was tracking the female contributor ratio - almost a year - not a single issue of the New Yorker had an equal number of male and female contributors.
The closest to parity was July 30, 2012 issue which had a 38% female contributor rate (parity would be 50%) and would even have made parity except for the three male poets in the issue.
This week (December 10, 2012) the parity rate is 15%.
They no longer allow a non-paywall link to the magazine's table of contents but they do to the "Shouts and Murmurs" pages (posted here for your convenience with a star next to each female contributor) and the list of contributors demonstrates a parity rate of 17%. These are their regulars, not one-off writers, and is probably the real barometer of the New Yorker's acceptance of female participation.
As an experiment, I clicked on a back issue of the New Yorker at random. I got the February 9, 1981 issue - 30 years ago. Out of the ten bylines, four are female. That's right, 30 years ago the parity rate for a randomly-selected issue of the New Yorker was 40%.
At the rate the New Yorker is going it will have an equal number of male and female bylines... never.