Logistics model percentage with absence of limiting factors

The question:

The following table shows the number *C*, in millions, of basic subscribers to cable TV in the indicated year. These data are from the *Statistical Abstract of the United States*.

Year | C

1975 | 9.8

1980 | 17.5

1985 | 35.4

1990 | 50.5

1995 | 60.6

2000 | 66.3

(a) Use regression to find a logistic model for these data. (Let *t* be the time measured in years since 1975. Round the terms to two decimal places and round *r* to three decimal places.)

$\displaystyle N = \frac {69.78}{1+7.08e^{-0.194t}}$

(b) By what annual percentage would you expect the number of cable subscribers to grow in the absence of limiting factors? (Round your answer to one decimal place.)

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