The relationship between college enrollment and tuition

I spent my evening determining a reasonable expected growth rate for future college tuition. The graph below displays the correlation between college attendance rates and tuition. While I’m not concluding causation from the data, it seems plausible that increased enrollment rates have led to higher tuition costs. With enrollment now peaking at around 100% and appearing to decline, I anticipate a lower future growth rate. The historical growth rate was approximately 6%, but I’m considering a rate closer to 2% going forward.