Due to the many wars fought by Sweden, the crown needed some means of rewarding its officers, and since the royal coffers were not without end, ennoblement and grants of land were useful substitutes for cash payments. During the 17th century, the number of noble families grew by a factor of five. In less than a century, the nobility's share of Swedish land ownership rose from 16% to over 60%, which led to considerably lower tax revenue for the crown. The "Reduction" of 1655 and 1680, however, brought land back into the crown's possession.