This graph shows the likelihood of the first number being a specific digit.
The reason for this is pretty complicated. It has to do with logarithmic growth. Some experts can use this law to detect fraud. For instance, if someone is making up numbers in a bank account or some tax returns they would tend to make sure the numbers are equally random. If they see there are an equal amount of numbers starting with a 9 and a 1, this numbers are most likely false. Crazy, huh?