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: Mar '18 4.75 GiB / 12.29 GiB / 17.05 GiB Apr '18 3.16 GiB / 5.20 GiB / 8.36 GiB / 10.93 GiB yesterday 148.25 MiB / 135.70 MiB / 283.95 MiB today 160.45 MiB / 331.78 MiB / 492.24 MiB / 526 MiB wlan0: Not enough data available yet.