There s nothing wrong with using the population clock figure but your calculation doesn t match the population clock figure At the time that your figure was 22 078 000 the official clock was just over 22 064 000 an error of 14 000 That translates to about what the official population clock will show in 11 5 days Another issue is that the population clock figure doesn t increase at a constant rate Earlier this year it was incrementing at about one person every 91 seconds It s now about one person every 71 seconds The last and most policy critical issue is that you re attributing the the figure to a source when the figure isn t supported by the source The figure is a calculation based on a source which is original research