Here are some on-point stats from the Bureau of Justice Statistics:
Data Collection: Police-Public Contact Survey (PPCS)
Data from 1999, 2002, 2005, 2008, 2011 linked on that page.
Data Collection: Police-Public Contact Survey (PPCS)
Status: Active
Frequency: Every three years since 1996
Latest data available: 2011
Provides detailed information on the characteristics of persons who had some type of contact with police during the year, including those who contacted the police to report a crime or were pulled over in a traffic stop. The PPCS interviews a nationally representative sample of residents age 16 or older as a supplement to the National Crime Victimization Survey. The survey enables BJS to examine the perceptions of police behavior and response during these encounters.
Frequency: Every three years since 1996
Latest data available: 2011
Provides detailed information on the characteristics of persons who had some type of contact with police during the year, including those who contacted the police to report a crime or were pulled over in a traffic stop. The PPCS interviews a nationally representative sample of residents age 16 or older as a supplement to the National Crime Victimization Survey. The survey enables BJS to examine the perceptions of police behavior and response during these encounters.

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