Marital rape is explicitly criminalised in the countries in pink. As it may or may not be prosecutable under ordinary rape statutes, it should not be inferred that marital rape is permissible in the unhighlighted countries.
Sources: Unicef 1997UNIFEM 2003
Above is an image of a map clearly demonstrating where spousal rape and is not a crime. If you look at the map you will clearly see that is is not a punishable crime in any member state of the Organization of Islamic Conference (thus states that adhere to the Cairo Declaration on Islamic Human Rights).
Save for Turkey that is re-adjusting many aspects of its criminal code in hopes of joining the EU at some point in the future.