Mark Davis posts on the official Google blog - based on analysis of the pages that Google's search engine indexes, the use of Unicode on the web just surpassed that of ASCII and Western European encodings for the first time.

 

Having ~25% of the world's web pages using a Unicode encoding should not be confused with the actual content on the pages - don't assume that the % of non-Western language content has increased at this rate. A large number of English websites now use UTF-8 encoding only because it's the default encoding for many development tools and data types (XML, JSON, etc) and doesn't cost them anything in terms of bytes used. But at least all those sites now have the ability to support non-Western scripts - a big step in the right direction :-)