Which country uses IoT the most?

I'm curious to know, which country in the world has embraced the Internet of Things (IoT) technology the most? Are there any particular regions or nations that have significantly invested in IoT infrastructure and applications, leading them to be at the forefront of this technological revolution? It would be interesting to learn about their strategies, the industries they've prioritized for IoT integration, and the impact it's had on their economy and society as a whole. Additionally, are there any challenges or obstacles that these countries have faced in their IoT adoption journey, and how have they managed to overcome them?