Are there any nations, cities, states, or other municipalities which allow Esperanto to be learned as a second language in their school system? Are there any notable non-public schools which do? If there are such schools, are they effective in producing Esperanto speakers?
According to the studies referenced in this question teaching Esperanto in a early school setting would seem to be more beneficial than teaching another natural language, especially since the quality of instruction is often very low (as it is in my native US).