As x increases from 0 to 1, y decreases from 89 to 55. This could happen if 89 were multiplied by the rate of change factor 0.62: 0.62(89) = 55. Likewise, if we mult. 55 by 0.62, we get 34, which also agrees with the table values for y.
Thus, this is an example of exponential decay, with decay constant 0.62.