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: May '18 3.64 GiB / 9.57 GiB / 13.21 GiB Jun '18 2.14 GiB / 5.01 GiB / 7.15 GiB / 9.98 GiB yesterday 108.71 MiB / 138.57 MiB / 247.28 MiB today 31.65 MiB / 41.86 MiB / 73.51 MiB / 144 MiB wlan0: Not enough data available yet.