According to the U.S. Bureau of Labor Statistics, prices for internet services and electronic information providers were 23.41% lower in 2017 versus 1997.
Between 1997 and 2017: Internet services experienced an average inflation rate of -1.32% per year. In other words, internet services costing $50 in the year 1997 would cost $38.29 in 2017 for an equivalent purchase. Compared to the overall inflation rate of 2.14% during this same period, inflation for internet services was significantly lower.
Raw Consumer Price Index data from U.S. Bureau of Labor Statistics for Internet services and electronic information providers: