I am currently trying to acquire statistics and studies regarding trends and historic data regarding the total number of people that are learning Chinese as a foreign language globally along with country level statistics.
I have read that it is estimated that up to 100 million people are studying Chinese as a second language by the year 2020. However, I have not yet stumbled upon the source study that can elaborate how this conclusion has been reached.
Anyone that could refer me to some recent or old studies on this subject?