Lmao!!! 40% reduction, eh??!!I couldn't find a similar study regarding Ontario. As to Germany:
Timo Mitze, Reinhold Kosfeld, Johannes Rode, Klaus Wälde 22 June 2020
Confronted with a novel, aggressive coronavirus, Germany implemented measures to reduce its spread since March 2020. Requiring people to wear face masks in public places has, however, been a subject of controversy and isolating the effect of mask-wearing on the spread of COVID-19 is not simple. This column looks at the town of Jena and other German regions that introduced face masks before the rest of the country to see whether the requirement makes a difference in the number of new COVID-19 cases. Requiring face masks to be worn decreases the growth rate of COVID-19 cases by about 40% in Germany.
According to Al-Jazeera Germany made masks mandatory throughout the country in April: https://www.aljazeera.com/news/2020/8/17/which-countries-have-made-wearing-face-masks-compulsory
This was the result


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