Crimes committed by illegal immigrants, whether as violent as murder or as petty as shoplifting, are not documented by the federal government.

Why? Well, because that would make the federal government look really, really bad. Meanwhile, we do know many crimes are committed each year by Pacific Islanders and Alaska Natives.

However, a little digging by Fox News has shed some light on just how bad illegal immigration is, not only for working class Americans, but for the country entirely when it comes to crime and violence.

The approximately 11.7 million illegal immigrants account for about 13.6 percent of all crimes committed in the country. Nearly 12 percent of murder sentences are credited to illegal immigrants, as well as 20 percent of kidnapping sentences and 16 percent of drug trafficking sentences.

Additionally, there are about 2.1 million legal or illegal immigrants living in the US with criminal convictions that are either in prison and being paid for by the American taxpayer or living free.

And each year, approximately 900,000 legal and illegal immigrants are arrested, while another 700,000 are released from prison.

But, it doesn’t stop there. Immigration and Customs Enforcement (ICE) believes that there are more than 1.2 million illegal immigrant criminals still at large.

In the most prominent states open for illegal immigrants, the numbers are even worse. Take a look:

■ In Florida, there were 5,061 illegal immigrant inmates in state prison facilities as of June 30, but neither the state Department of Corrections nor the Florida Department of Law Enforcement track the number in county prisons, spokesmen for those agencies told FoxNews.com. ■ In Illinois, where state prisons house 46,993 inmates, some 3,755 are illegal immigrants, according to Illinois Department of Corrections figures. Once again, state officials do not compile figures for county jails, although a Cook County official estimated that nearly 6 percent were illegal immigrants. ■ In Arizona, neither state public safety officials nor the governor’s office could produce figures showing the number of criminal illegal immigrants held in county jails, but state prison figures released by the Arizona Department of Corrections show out of 42,758 prisoners held in state facilities in July, about 10.8 percent were illegal immigrants. ■ In California, there were 128,543 inmates in custody as of Aug. 12, but the state, which has been criticized for its leniency toward illegal immigrants, no longer keeps track of the citizenship status of inmates. As of July 31, 2013, the last time figures were documented, there were as many as 18,000 “foreign-born” citizens in California state prisons of 133,000 incarcerated. The Board of State and Community Corrections provided figures to Fox News from 2014, showing there were 142,000 inmates in 120 county prisons, but while everything from mental health cases to dental and medical appointments are closely tracked, the number of illegal aliens — or even non citizens — is not.

In the last conducted research back in 2011, there were 55,000 illegal immigrants in federal prison and 296,000 in state and local prisons. Experts say these numbers are much, much larger today.

Finding those numbers out, however, could be nearly impossible, as the Obama administration has made a few procedural changes which may exclude immigrants who would have been counted as “illegal immigrants” before.