Since I previously made an Indego PHP library for Philadelphias bike share, I decided to use the library to generate pretty current and historical graphs of bicycle availability at https://indego.ericoc.com/
I was inspired by the awesome graphs showing the availability of bikes at each station during commuting times on Randal Olsons blog here!
I have been running this script as a cron job on my personal server. It has been collecting data from the Philly Indego Bike Share API and storing that data to a local MySQL database for just over a year. I can tell you how many bikes and empty docks were at each bike-share station in Philadelphia (at the 10 minute intervals, anyways) since November of last year (2015). As of November 2016, I have recorded about 4.5 million rows totaling ~180MB and I will soon hit 50,000 records for each bike-share station!