CBP just released their FY2018 enforcement statistics ending this past March. The link to the statistics website is here (opens in new window).
The report includes categories for arrests of individuals with criminal convictions, nationwide arrests by gang affiliation and nationwide drug seizures.
As a point of reference, in FY 2017, agents arrested more than 20,000 criminal aliens and nearly 11,000 individuals who were wanted by law enforcement authorities. Additionally, they seized more than 2.14 million pounds of narcotics, including nearly 1,500 pounds of fentanyl and other synthetic opioids.