Both studies were produced under the direction of Betty D. Maxfield for the National Research Council Commission on Human Resources, and published by the federal government in 1980. The former uses 1977 data, and the latter 1979 data. I put up only an abstract here, not full-text, because the data analyzed in the study are now quite old, and I don't have a digital version of the original. Yet philosophy is growing more slowly than the average field of the humanities.
Philosophy has a mixed record on the employment of women.
Ph.D.s of all the fields of the humanities, and is the only field failing to show a steady growth in the percentage of women Ph.D.s over the years. On the other hand, women are paid more than men in at least two levels of experience, and philosophy is the only field of the humanities in which, over the employment life of an average Ph.D., the sum of a woman's salaries exceeds the sum of a man's. The tenure rate for women in philosophy is the second lowest of the humanities, and the average number of years required for a woman to be tenured in philosophy is the second highest of the humanities. Philosophy is below average for the humanities in its proportion of black Ph.D.s, but second highest in its proportion of Asians and native Americans. Philosophers are typically younger than all other humanists.