Here is data like what I have shown before with the percentage change in the transit ridership between the 4th quarter of 2008 versus the 4th quarter of 2007. So even without the route cuts impacting the results, here are the results of the latest data on transit ridership in nation's the largest bus agencies. It's hard to tell from the graph, but Pittsburgh is in that range of virtual no change, +0.3%.
See the link above for the actual source and the names of the relevant transit agencies that are being depicted for each region in the chart. Off the top of my head I'm not sure what is up in Cinci or Houston. The highest growth areas is far from explained by population growth alone. Even Phoenix is not growing that much population-wise, and Detroit is not doing well economically or I presume with population. Phoenix opened up a new subway line last year. Other than that I will let the graphic strand on it's own if anyone has thoughts on Pittsburgh near zero performance while transit usage is shooting up across the country. Zero is at least an improvement from the results that were impacted by the route cuts.