&gt; Esperanto&#x27;s success is really astonishing. Esperanto is widely spoken around the world, and has continued to gain new speakers and even many native speakers for over a century. No constructed language can boast anything like that.<p>What evidence do you have the the number of Esperanto speakers are increasing? The best source I could find<p>&gt; <a href="http:&#x2F;&#x2F;linguistics.stackexchange.com&#x2F;a&#x2F;1480" rel="nofollow">http:&#x2F;&#x2F;linguistics.stackexchange.com&#x2F;a&#x2F;1480</a><p>thinks that this question is very difficult to answer: Depending on the data that one considers the number of Esperanto speaker can be increasing or decreasing (first diagram hints at a strongly decreasing number since about 1990, second at an slowly, but steadily increasing number).