While watching this video, it makes the claim at about the 12 minute mark that US crime rates are lower across the board.
It then shows a graph that lists various violent crimes with numbers in columns for 1992 and 2011.
US Crime Rates: 1992 vs. 2011 Violent Crime: 757.7 vs. 386.3 Murder Rate: 9.3 vs. 4.7 Rape Rate: 42.8 vs. 26.8 Robbery: 263.7 vs. 113.7 Aggravated Assault: 441.9 vs. 241.1 Property Crime: 4903.7 vs. 2809.7 Burglary: 1168.4 vs. 702.2 Larceny/Theft: 3103.6 vs. 1976.9 Motor Vehicle Theft: 631.6 vs. 229.6
Personally, I'm a little annoyed that the chart doesn't show units (like incidents per thousand persons) and also fails to show a source. To make things worse, it does not define some of the more ambiguous "crimes" such as "violent crime" and "property crime."
I have heard elsewhere that many crimes were at all-time highs in the early and mid 1990's, but I am more concerned with these exact numbers. How close are they to reality? I understand that the answer will have to take some liberties on what the numbers actually mean (units) and might just have to do some (gulp) math. Sorry about that. I didn't make the claim; I'm just skeptical about it.
I think the easiest way to verify these numbers with reality would be ratios. For example, "Violent crime" is down 51% (386.6/757.7), according to the chart. Does this match with a respectable source?