In September 2018, Google has issued "Google Dataset Search Engine"; it allows researchers from different disciplines to search, locate, and download online datasets that are freely available for use from different application domains.
It could be remarked that, this search engine is still beta version; you may not find all the datasets, but alt least it facilitates the task of finding suitable datasets.
You can have access to any kind of dataset through Google's dataset search engine. It has got a compilation of more than 25 million datasets. I think you'll find your required dataset as well.