TABLE 1: New Customers per Month (Abbreviated)
ym existing new total
199607 0 20 20
199608 4 14 18
199609 10 9 19
199610 11 9 20
199611 11 10 21
199612 20 5 25
199701 22 5 27
199702 19 2 21
199703 23 1 24
199704 23 4 27
...