Real Estate Price change module for the Netherlands. In the Netherlands, one of the ways to index rent prices is to multiply the price with the Dutch Bureau of Statistics' (CBS, http://www.cbs.nl/) Consumer Price Index (CPI). The CPI is a float number larger than 1.0 that indicates the multiplication factor with which the old rent is to be multiplied. A Web service was set up at https://cpi-nl.heroku.com/ that serves these CPI numbers.