His efforts were brilliantly successful in that Esperanto is the only deliberately created language to have generated and sustained a body of fluent (or even semi-fluent) speakers. There are of course excellent historical, linguistic, and sociological reasons for this, although they are not as well studied as one might like. Of course Esperanto has not succeeded in achieving sufficient international visibility to be used in all the contexts where it would be useful. At the moment it seems unlikely that it ever will, although accurate prognostication depends on theoretical assumptions that are not very well developed.
Esperanto has about two million speakers worldwide. This puts it on a par with "minority" languages such as Lithuanian or Hebrew.
Esperanto is the most widely used sen nacia lingvo (nationally independent language). Millions of people use Esperanto daily for both written and spoken international communication. In China it is taught in universities. It is one of the official languages of Australia. There are numerous Esperanto websites, radio broadcasts and publications. There are original Esperanto works on almost every subject. Additionally, there are thousands of translations of existing works in literature, philosophy, science, religion, theatre and music.
The Esperanto Movement has organizations and users in virtually every country. It has official ties to organizations within the United Nations. Recently, the UN began to translate its minor diplomatic documents into Esperanto to help reduce translations costs and errors.
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