The Tourist Office keeps statistics on just about everything, including the number of downloads, on the Android platform at least, of the audio guides to Nerja.
From December 2011 to May 15th 2012, the figures look like this:
In Spain, 51.3% of the downloads are by Spanish nationals, 10.4% by British and 8.92% by Americans. These are followed by the Swedish, German, Irish, Belgian, Italian and French.
For downloads from outside Spain, the USA is top with 32.85%, South Korean is second with 10.3% and Japan is third with 6.99%. These are followed by Germany, Britain, France, Spain (downloads from devices with Spanish prefix but from a foreign country), Russia, India and Taiwan.