<image>The annual income \textit{x} (unit: 10,000 yuan) and annual food expenditure \textit{y} (unit: 10,000 yuan) of several households in a certain area were surveyed. The survey showed that the annual income \textit{x} and annual food expenditure \textit{y} have a linear correlation, and the regression line equation of \textit{y} with respect to \textit{x} was obtained from the survey data: . From the regression line equation, it can be seen that for every increase of 10,000 yuan in the household annual income, the annual food expenditure increases by an average of ____________ 10,000 yuan.