According to the world bank, 2015 population of Mexico is around ~125 million.  This means that roughly 75% of the population could be affected.
<a href="http:&#x2F;&#x2F;data.worldbank.org&#x2F;indicator&#x2F;SP.POP.TOTL" rel="nofollow">http:&#x2F;&#x2F;data.worldbank.org&#x2F;indicator&#x2F;SP.POP.TOTL</a>