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Precalculus: Graphical, Numerical, Algebraic
Exercises $11-18$ refer to the data in Table 1.6 below, showing the percentage of the female and male populations in the United States employed in the civilian work force in selected years from 1954 to 2004 .
$$
\begin{array}{lrl}{\text { Year }} & {\text { Female }} & {\text { Male }} \\ \hline 1954 & {32.3} & {83.5} \\ {1959} & {35.1} & {82.3} \\ {1964} & {36.9} & {80.9} \\ {1969} & {41.1} & {81.1} \\ {1974} & {42.8} & {77.9} \\ {1979} & {47.7} & {76.5} \\ {1984} & {50.1} & {73.2} \\ {1989} & {54.9} & {74.5} \\ {1994} & {56.2} & {72.6} \\ {1999} & {58.5} & {74.0} \\ {2004} & {57.4} & {71.9}\end{array}
$$
(a) According to the numerical model, what has been the trend in females joining the work force since 1954 ?
(b) In what 5-year interval did the percentage of women who were employed change the most?