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: Jul '19 9.25 GiB / 45.51 GiB / 54.76 GiB Aug '19 5.92 GiB / 32.03 GiB / 37.96 GiB / 50.85 GiB yesterday 449.83 MiB / 2.05 GiB / 2.49 GiB today 26.66 MiB / 227.33 MiB / 253.99 MiB / 1.77 GiB