Reports of sexual assault in the military have jumped 8 percent, according to new figures from the Pentagon.

The statistics is likely to fuel debate in Congress about sex crimes in the military and whether leaders are doing enough to stop it, especially in light of the fact that most sexual assault crimes aren’t even reported, according to the Washington Post. However, the report did note that there has been some improvement in that area, with estimates that 24 percent of victims filed reports in the most recent fiscal year, up from just 11 percent two years ago.

Congress has been pressuring the Pentagon to show progress in preventing and prosecuting sex crimes, and lawmakers have even threatened to overhaul the military justice system. This latest report could add fuel to that fire.

Defense Secretary Chuck Hagel is expected to unveil the report on Thursday. The White House and Congress will be briefed in advance.

A total of 5,400 service members filed reports of sexual assault last year, an increase from 5,000 the year before. The increase pales in comparison to the 50 percent jump in 2013, which stunned lawmakers and advocacy groups.

The Pentagon will say that the increase is due to the fact that more people are willing to report sex assaults, not because there are more sex assaults occurring, indicating greater trust in the system.

Sen. Claire McCaskill (D-Mo.) said in a statement that lawmakers want to see that reporting of assaults is up while actual incidents are declining.

In an anonymous survey of U.S. service members, RAND Corp. found that 19,000 troops were victims of “unwanted sexual contact,” which can cover many offenses, a figure that is down from 26,000 two years ago but is still at the same level it was at in 2010.

The Pentagon has been pushing to reduce sexual assault cases and punish offenders after being accused of ignoring the problem for years and allowing it to fester. However, recent high-profile cases involving high-ranking commanders have embarrassed the Defense Department and raised questions about whether the problem was institutional.