VnStati Network Statistics
I made this page using vnStat and vnStati. It has been monitoring traffic since 7th March 2015
The graphs are updated by Cron once an hour.
I have made a how to here, if you would like to try this yourself.
Traffic statistics on a hourly basis for the last 24 hours
Traffic statistics on a daily basis for the last 30 days
Traffic statistics on a monthly basis for the last 12 months
All time top 10 traffic days
And this is the live output from vnstat:
rx / tx / total / estimated eth0: Aug '17 2.55 GiB / 9.81 GiB / 12.36 GiB Sep '17 2.85 GiB / 4.23 GiB / 7.08 GiB / 8.30 GiB yesterday 89.52 MiB / 124.95 MiB / 214.48 MiB today 36.64 MiB / 106.93 MiB / 143.58 MiB / 251 MiB wlan0: Not enough data available yet.