Between 1989 and 2010, U.S. attorneys seized an estimated $12.6 billion in asset forfeiture cases. The growth rate during that time averaged +19.4% annually. In 2010 alone, the value of assets seized grew by +52.8% from 2009 and was six times greater than the total for 1989. Then by 2014, that number had ballooned to roughly $4.5 billion for the year, making this 35% of the entire number of assets collected from 1989 to 2010 in a single year. According to the FBI, the total amount of goods stolen by criminals in 2014 burglary offenses suffered an estimated $3.9 billion in property losses. This means that the police are now taking more assets than the criminals.
I will remind folks that civil asset forfeiture is by definition taken from innocent people, ie those not convicted of a crime.
Update: It would be interesting to see the racial/ethnic mix of those whose stuff is seized. Somehow, I don't imagine the victims of theft-by-cop are a bunch of rich white people.