Surprisingly, China is not even in the top 25! Did Google trend include China in the analysis at all?
google trends is people using google search engine to search for keywords and in China people already know what "blockchain" is, so obviously when they know about something there is no need for searching about it.
and the same goes for other countries such as Ghana that OP mentioned in his second comment after about a year! in third world countries people are not familiar enough with bitcoin and blockchain technology and since recently there is lots of activity in those countries, obviously people use search engines such as google to find out more information about bitcoin and blockchain.
