Thanks for the reply, but this would give unique visitors who have been
active in successive months, since you have the then function. And given
that usage fluctuates, some users may have been active at least 5 times
every month, but many may have just paid a visit every other month
during the time period, or just once during the time period. By doing
the segment, you get people who have been consistently visiting the site
month in and month out, but I just wanted on a monthly basis.