Before the 1080s, the majority of officials drafted came from a regionally diverse background; afterwards, intraregional patterns of drafting officials became more common. Hartwell writes that during the Southern Song, the shift of power from central to regional administrations, the localized interests of the new gentry, the enforcement of prefectural quotas in preliminary examinations, and the uncertainties of a successful political career in the factionally split capital led many civil servants to choose positions that would allow them to remain in specific regions. Hymes demonstrates how this correlated with the decline in long-distance marriage alliances that had perpetuated the professional elite in the Northern Song, as the Southern Song gentry preferred local marriage prospects. It was not until the reign of Emperor Shenzong (r. 1068–1085) that the now heavily populated regions of South China began providing a quantity of officials in policy-making posts that were proportionate to their share of China's total population. From 1125 to 1205, about 80% of all those who held office in one of the six ministries of the central government had spent most of their low-grade official careers within the area of modern southern Anhui, southern Jiangsu, Zhejiang, and Fujian provinces. Almost 100% of these officials were born and buried within this southeastern macroregion.