定数/NNAIN定数NAI|AI_PERFORMANCE_EVALUATE_CITY_UPGRADES_RATIONAI|AI_PERFORMANCE_EVALUATE_CITY_UPGRADES_RATIOloading_screen/common/defines/00_defines.txt:6761/56, check all locations once per 5 years if they should upgrade city定義loading_screen/common/defines/00_defines.txt:6760.017