Really. It's not possible to extrapolate anything from that number. After all one of the biggest abuses of policing is the way that they deliver routine tickets in such volume that it financially cripples a community. Ferguson has more warrants for arrest than people and almost all of them are for failure to pay traffic fines. Living in fear of a police officer pulling you over for being over the limit by a single MPH (Yes this does happen) and giving you a ticket that will put you in debt for years (and possibly prison) is the very definition of abuse.
Granted not all of that rests on the heads of cops. Most of it resides on the government and court system that allow loan sharks to take over the collections of tickets in a way that traps the people in debt. These agencies offer to take over collections for free but then add a service charge to ticket payed by the person cited. All of the money that the person pays goes towards that fee until it is payed off, but the fee keeps increasing with missed payments. The result is that these people are stuck in a cycle of payments until a warrant goes out for their arrest for failing to pay a ticket and then they are sent to prison.
As the Ferguson report on policing practices said: when the city mayor asked the police chief to deliver 10% more revenue he responded "we can try."
I'm sure that most of these stops were perfectly routine. Doesn't mean that the police aren't being abusive.