premise: Goodlettsville is a city in Davidson and Sumner counties, Tennessee. Goodlettsville was incorporated as a city in 1958 with a population of just over 3,000 residents; at the 2010 census, the city had a total population of 15,921 and in 2015 the population was 16,994. Goodlettsville chose to remain autonomous in 1963 when the city of Nashville merged with the government of Davidson County.
hypothesis: after being founded in the 50's, with a minimal resident population, the population slowy increased in the later 2000's
reason: it states the city was founded in the 1950's and has a very small population that was slowly increased and as of the 2015 census there are 16,994 residents