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 wlan0: Not enough data available yet. eth0: Apr '20 3.81 GiB / 37.30 GiB / 41.10 GiB May '20 3.83 GiB / 79.65 GiB / 83.48 GiB / 88.53 GiB yesterday 101.37 MiB / 2.53 GiB / 2.63 GiB today 20.94 MiB / 477.02 MiB / 497.96 MiB / 2.10 GiB