A+B = 1, ergo B = 1-A

Here's a chart from Negligent Driving that would probably make Darrell Huff blush.

Guess what? When the percentage of fatal accidents involving alcohol goes down, the percentage of accidents not involving alcohol goes up!




The headline above the chart claims the overall quantity of traffic fatalities have increased. Not sure if that's true (and per capita would be more relevant), but the chart attempting to show the alleged skyrocketing problem with negligent driving doesn't appear to have anything to do with quantity.

Initially, I wondered why the red and black lines don't sum to a perfect 100%, but Fatalities involving BAC below the legal limit probably explains what appears to be the small missing percent.