since I documented the 10 centavos some minutes ago, I thought I would check the 5 centavos from 2011 against a 2006, and I also found the numeral on the 2011 thicker! According to numista this should only the case for the 2013 coin, but obviously it started in 2011!
I do NOT know, if in 2011 you have both thin and thick numerals!
Ole