Extrapolating the increase in prostate cancer diagnoses

"prostate cancer cases increased by 54% between 1975 and 2010, but mortality declined by 30% over the same period." [link]

Focusing on the increasing number of men diagnosed, "Our earliest data point comes from 1973. Back then, 1 man in 16 could expect to be diagnosed with the disease. Between 1973 and 2013, 38 available data points document the increase in the reported incidence of prostate cancer over 40 years." [link] The current proportion is 1 in 6 or 1 in 5. This proportion seems to be increasing linearly with time and based on linear extrapolation half of all men will be diagnosed with prostate cancer by 2124 (110 years from now). See this [figure] illustrating the extrapolated regression cursve.