Hi Sam,
With comparing this list[1] with the Wikipedia[2] I ended up with this list of countries that you have missed:
* Official RTL language:
Afghanistan, "Dari Persian, Pashtu (both official), other Turkic and minor languages"
Chad,"French, Arabic (both official); Sara; more than 120 languages and dialects"
Comoros,"Arabic and French (both official), Shikomoro (Swahili/Arabic blend)"
Djibouti,"French and Arabic (both official), Somali, Afar"
Mauritania,"Hassaniya Arabic (official), Pulaar, Soninke, French, Wolof"
Maldives, Maldivian Dhivehi (official); English spoken by most government officials
* Partial RTL Language
Turkey,"Turkish (official), Kurdish, Dimli, Azeri, Kabardian"
India, "Hindi 30%, English, Bengali, Gujarati, Kashmiri, Malayalam, Marathi, Oriya, Punjabi, Tamil, Telugu, Urdu, Kannada, Assamese, Sanskrit, Sindhi (all official); Hindi/Urdu; 1,600+ dialects"
Ethiopia,"Amharic, Tigrigna, Orominga, Guaragigna, Somali, Arabic, English, over 70 others"
Somalia,"Somali (official), Arabic, English, Italian"
Tanzania,"Swahili, English (both official); Arabic; many local languages"
Guyana,"English (official), Amerindian dialects, Creole, Hindi, Urdu"
Uganda,"English (official), Ganda or Luganda, other Niger-Congo languages, Nilo-Saharan languages, Swahili, Arabic"
Best Wishes,