If your investments are getting $9\mathrm{.}48\%$ per year but your purchasing power is only growing $4\mathrm{.}51\%,$ how fast are prices rising?

Enter your answer as a percentage with four decimal places but without the percent symbol. For example, if your answer is $90\mathrm{.}1234\%,$ enter $90\mathrm{.}1234$