Vasectomies

Vasectomy rates increased after the Recession - and the Crisis - began.

Which doesn't mean there's a causal relationship there.  The increase does appears large enough to be statistically significant. As the article mentions, there are probably factors beyond economics involved, as there would be with family planning decisions made at any time. Still, it's not unprecedented for people to have fewer children when the economy is doing poorly: The Great Depression coincided with a large drop in birth rates.

It could be seen as an indicator that this is the point at which the Crisis began - not earlier, nor later, but during this single period.