Given this text about speakers of varieties of Louisiana French, has the number of French speakers in Texas increased or decreased since the middle of the twentieth century?

Context: Reliable counts of speakers of Louisiana French are difficult to obtain as distinct from other varieties of French. However, the vast majority of native residents of Louisiana and east and southeast Texas who speak French are likely speakers of Louisiana French.

In Louisiana, as of 2010, the population of French speakers was approximately 115,183. These populations were concentrated most heavily in the southern, coastal parishes.

In Texas, as of 2010, the French-speaking population was 55,773, though many of these were likely immigrants from France and other locations, living in the urban areas. Nevertheless, in the rural eastern/southeastern Texas counties of Orange, Jefferson, Chambers, Newton, Jasper, Tyler, Liberty, and Hardin alone—areas where it can be reasonably presumed that almost all French speakers are Louisiana French speakers—the total French-speaking population was composed of 3,400 individuals. It is likely a substantial portion of the 14,493 speakers in Houston's Harris county are also Louisiana French speakers. With this in mind, a marked decline in the number of French speakers in Texas has been noticed in the last half of the twentieth century. For example, at one point the French-speaking population of Jefferson County was 24,049 as compared to the mere 1,922 today. Likewise, in Harris County the French-speaking population has shifted from 26,796 to 14,493 individuals.

Louisiana French-speaking populations can also be found in southern Mississippi and Alabama, as well as pockets in other parts of the United States.

Answer: It has generally decreased.  For example, in the second half of the twentieth century, the French-speaking population of Jefferson County was 24,049 as compared to 1,922 today. Similarly, in Harris County the French-speaking population has shifted from 26,796 to 14,493.