Table 3 Identified long-term cycles by using periodogram analysis

Region gN VolN
Total 20 month, 48 month 20 month, 48 month
SMetro 20 month, 48 month 20 month, 48 month
5Cities 24 month, 48 month 24 month, 48 month
NMetro 20 month, 48 month 20 month, 48 month