If car usage is going down but pedestrian injuries are going up? The pedestrians are not crashing into one another with greater frequency...
What I would like to see is mortality rates of pedestrians in Paris in general. That might be the actually interesting trend.
As a pedestrian, I've had FAR more encounters with aggressive cyclists than aggressive drivers (also anecdotal). Makes walking downtown more stressful.
Anyhow, talking about the hospitalization rate without the mortality rate is very odd and smells of manipulation one way or the other.