Source: Denver Open Data Catalog
The Denver Police Department calculates response times for police calls for service from the time of the 911 call to the time an officer arrives on scene. The link below includes the response times by year for high priority calls and low priority calls.
Uniform Crime Reporting (UCR) is the primary data standard used by the FBI to record crime for law enforcement agencies across the United States. It tracks eight primary offenses: murder, rape, robbery, aggravated assault, burglary, theft, auto theft and arson. UCR counts only the highest crime category within an incident. UCR provides a platform to compare crime across jurisdictions.
National Incident-Based Reporting System is used by local law enforcement agencies to collect more detailed information about a specific incident. NIBRS collects 46 different crime categories and includes all categories within an incident.
Citywide Data - By Month (pdf)