They aren't staying constant. Per data from the FBI they increased by 17% in 2017 and may be significantly higher than that due to undercounting.
https://www.vox.com/policy-and-politics/2018/11/13/18091646/fbi-hate-crimes-2017
FBI: reported hate crimes increased by 17 percent in 2017
The number of hate crimes reported in the US increased by 17 percent in 2017, with a particular surge in reports of anti-Jewish incidents, according to a new report from the FBI.
Most major categories of hate crimes — whether motivated by race or ancestry, religion, or sexual orientation — were reported at higher rates in 2017 than in 2016. Reported anti-Jewish crimes rose by more than 37 percent, perhaps pointing to an increase in anti-Semitism, which has gotten more and more attention after the Pittsburgh synagogue shooting.
Reported anti–Hispanic and Latino crimes also rose by more than 24 percent, and anti–American Indian or Alaska Native crimes rose by nearly 63 percent — although the number of incidents in these categories was still overall far lower than, for example, anti-black and anti-Jewish incidents.
At the same time, reported anti-Muslim crimes decreased by about 10 percent, although after sharp increases in recent years. Reported incidents motivated by gender identity also saw a very slight decrease of about 4 percent.
There are a few caveats here. The report only measures crimes reported to the FBI, so, as the FBI cautioned, the increase might not mean the number of hate crimes rose in 2017. It could be a result (at least partially) of more of those hate crimes being reported to the FBI — particularly because about 1,000 more law enforcement agencies started contributing data in 2017.
More broadly, although the FBI’s report is the most comprehensive look at the nation’s hate crimes released every year, it is known to be woefully inadequate — because other federal surveys suggest it may undercount the number of hate crimes by the hundreds of thousands.
Over the past two decades, the FBI reported between 6,000 and 10,000 hate crimes each year in the US. But when the US Bureau of Justice Statistics (BJS) surveyed large segments of the population between 2007 and 2011 to try to gauge the real number of hate crimes, it concluded that there are nearly 260,000 such crimes annually.