In an attempt to determine any possible relationship between the year in which a U.S. penny was minted and its current mass (in grams), students weighed an assortment of pennies and obtained the following data. 

What valid conclusion(s) might they have drawn about the relationship between the masses of the pennies within a given year and from year to year?

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1968 1973 3.11 3.14 3.13 3.08 3.06 3.09 3.07 1977 1980 1982 1983 1985 3.12 3.12 2.51 2.54 3.10 3.11 2.53 2.49 2.53 3.06 3.08 2.54 2.47 2.53