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: Dec '17 2.99 GiB / 5.52 GiB / 8.51 GiB Jan '18 2.24 GiB / 3.68 GiB / 5.92 GiB / 9.68 GiB yesterday 118.82 MiB / 262.57 MiB / 381.39 MiB today 113.71 MiB / 97.79 MiB / 211.50 MiB / 217 MiB wlan0: Not enough data available yet.