Those numbers are in line with an overall rise in family unit apprehensions across the Southwest border, which increased from 41,435 in fiscal year 2017 to 50,036 this past fiscal year, a 21 percent rise. The Rio Grande Valley Sector, which covers 320 border miles and runs from Rio Grande City to Brownsville and up the coast to Corpus Christi, was far and away the biggest contributor to that total.
2018
2019 https://www.nytimes.com/2019/04/11/opinion/border-crisis-immigration.html
Roughly 103,000 unauthorized immigrants reached the U.S.-Mexico border in March, twice as many as in March 2018. 50k in a year in 2018
100k in a month 2019