Throughput       data/day       data/month    data/year
---------------  ------------   ------------  ------------
128 Kbit/sec     1.4 GByte      41.5 GByte    505.6 GByte
1 Mbit/sec       10.8 GByte     324 GByte     3.8 TByte
20 Mbit/sec      100.8 GByte    6.48 TByte    78.8 TByte
1 Gbit/sec       10.8 TByte     324 TByte     3.94 PByte

200 GByte a month is about 610 Kbit/sec ("kbps") continuous.

Networks must be provisioned for "peak use" periods, which likely correlate for
users in the same region, so enforcing or charging for total throughput doesn't
seem to make much sense?