Final answer:
Without trend or projection data, it is not possible to accurately calculate the year when the percentage of households without a personal computer will reach 5%.
Step-by-step explanation:
The student's question does not provide a specific trend or projection data that would allow us to calculate the exact year in which the percentage of households that do not own a personal computer will reach 5%. To predict such a trend, one would typically use statistical methods or models to analyze current and past data on computer ownership rates. For instance, if we knew the rate of decrease each year, we could extrapolate that data to estimate when the ownership percentage would become 5%. Without specific data on rates of decrease, it's not possible to provide an accurate year for when the percentage would reach 5%.