Translate "The smoking rates among pregnant women in Nova Scotia changed little between 1988 and 1992." to French?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Les taux de tabagisme chez les femmes enceintes de la Nouvelle-Écosse ont peu varié entre 1988 et 1992.