I don't understand why there are so many comments stating "useful graph", no offense but this graph is highly inaccurate. Taking a look at only one of your windows, you state that block 210k would of been at the start of 2013; actually the block 214563 marked the beginning. You estimate 420,000 at the start of 2017; when comparing the growth between now and the block in 2013, we should be at roughly 450k (my calculations were roughly 449534). Being off 10,000 blocks here and 30,000 blocks there might not seem like much to you, but it means a world of difference when this is potentially our future lifeline (at least influencing it). Thank you for your efforts to help the community, I do not mean to point out your errors in an aggressive manor; I hope you don't see it this way. I just advise people to carefully evaluate any data when making important decisions, especially this data.