I don't know, but Norway and Sweden with similar populations took different routes, with Norway opting for more distancing lockdown and Sweden with less, more like Japan. Outcomes for both countries wound up the same. Flattening the curve just prolongs the epidemic, and makes small late outbreaks more likely. It does nothing for the eventual outcome, which is to reach the 80 percent herd immunity level, as which time the immune population extinguishes the virus. The only real meaningful measure is to isolate the most vulnerable (i.e. old, sick) until the virus cannot reach them any more from the population (herd immunity).
Once the virus is out there and reached critical mass, it is going to do what it is going to do. These interventions are for public perception and the usual social control paradigm experiments.
Is there a source of data for which places have social distancing, with dates and measures?