Testing for equality of differences in proportions

Say I have the following college enrollment data:

California

In 1975, 188,234 men and 156,612 women were enrolled in California colleges.
In 2005, 194,416 men and 201,334 women were enrolled in California colleges.

Texas

In 1975, 132,261 men and 98,554 women were enrolled in Texas colleges.
In 2005, 140,082 men and 153,305 women were enrolled in Texas colleges.

Consider, for each state, the proportion of those enrolled in colleges who were female.

How would I go about computing the p-value for the null hypothesis that the 1975–2005 increase in this proportion was the same in Texas as in California?

• As stated, the hypotheses apply to the observations - in effect you observed the population quantities about which you wish to make a conclusion, in which case no statistics is required - they plainly differ (in effect the p-value is exactly 0). If that doesn't satisfy your needs, before even attempting inference, you need first to consider these issues: What is the population of interest? What is the model? (Without that, what does the question even mean?) – Glen_b Jun 2 '14 at 0:46
• Are you asking about a test for differences (i.e. null hypothesis of no difference), or a test for equivalence (i.e. null hypothesis of difference?). – Alexis Jun 2 '14 at 17:19