LaurensSwinkels , 
In order to contribute to #opendata , I post as much data as legally allowed on my data repository at Erasmus University. You can find data on Chinese equity markets, the global market portfolio, historical exchange rates (1916-1925), and global bond returns. Have a look!
https://datarepository.eur.nl/authors/Laurens_Swinkels/6487932 #econtwitter #finance #investing #research #data #datascience