Depending on the need for quantitative insight and evidence, try at least 3 of these 5
Finding data and statistics is fundamentally difficult because much data does not consist of text but rather numbers (or even visual information, sound recordings etc.). Using textual search terms to search for that kind of information thus needs to match the little bit of text that is in the titles/metadata/descriptions of these tables or datasets, instead of full texts of articles, reports etc.
Although some tools (like Google data set search) make a good attempt at indexing data and datasets, it is recommended to use more strategies.
Four strategies to find data and statistical information:
Note that some organisations might only provide information in their local language. With some addition (translation) efforts it is still possible to find to organisations, their data/tables and understand what is in the tables. But take care to only use data if your really understand what they stand for.