Something of hyperbole as a heading, but you can smother yourself in statistics here (http://internacional.elpais.com/internacional/2017/02/27/actualidad/1488194732_820452.html) about the huge numbers of foreigners which have changed Spain in the last 20 years.
Surprising to me is the number of Chinese which is almost as large as Brits. Perhaps mainland Spain is significantly different to Tenerife.
Thanks @Perikles (http://chalkcat.com/index.php?action=profile;u=6) Very interesting.