 remain the same size. </p>
</dd>
<dt>life_expectancy_1970</dt><dd><p>Life expectancy at birth in 1970.</p>
</dd>
<dt>life_expectancy_2000</dt><dd><p>Life expectancy at birth in 2000.</p>
</dd>
<dt>life_expectancy_2018</dt><dd><p>Life expectancy at birth in 2018.</p>
</dd>
<dt>dependency_ratio_total</dt><dd><p>The ratio of the not-working-age
population to the working-age population of 15 - 64 years.</p>
</dd>
<dt>dependency_ratio_child</dt><dd><p>The ratio of the under 15 population
to the working-age popu