555 days since the 2016 presidential election 365 days since Mueller has been on the job 199 days since the first charges were announced 54 days until the first trial is scheduled to begin

(CNN) Thursday marks one year since special counsel Robert Mueller was appointed to investigate Russian meddling in the 2016 US election. Mueller took over an investigation that was first opened by since-fired FBI Director James Comey in July 2016, during the campaign.

Mueller’s legal cases 22 people and companies charged 75 criminal charges brought so far 5 guilty pleas 1 person sentenced

The far-reaching investigation continues -- witnesses are still being interviewed, and trials are scheduled for later this year. As the proceedings have dragged on, the White House has adopted an increasingly hostile tone toward the investigation, which President Donald Trump has repeatedly called a "witch hunt" and a "hoax."

Here is a breakdown of what we know about one year of the investigation under Mueller, by the numbers.

In one year, Mueller has brought charges against 19 people and three companies, including a former White House adviser, three former Trump campaign aides -- including the campaign chairman at the time -- a prominent Russian oligarch and a dozen Kremlin-backed trolls. In all, these defendants are facing a combined 75 criminal charges, ranging from alleged conspiracy against the United States, bank fraud and tax violations to lying to FBI investigators and identity fraud.

Read More