The following data represents the population of united states in millions based on the census taken every 10 year from 1950 to 1990.
"\\begin{matrix}\n Year= & 1950 & 1960 & 1970 & 1980 & 1990 & \\\\\n \n Population \\\\\n \n in\\ millions & 166 & 199 & 226 & 252 & 278\n\\end{matrix}"
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