I just checked a relevant website. It appears that the prison population at a given point in 2013 was 84,000. It is reasonable to assume that it didn't vary too much either way during all of 2013. Many years ago (possibly about 30), I remember that there was some concern in the media that the prison population was approaching 40,000.
Of course this doesn't necessarily mean that there is more crime. It may just mean that people are locked up more easily. Or it could mean that there is less crime generally but that there is more serious crime. Another angle may be that there are more repeat offenders - assuming that repeat offenders are more likely to be banged up than first time or one-off offenders. It may even mean that sentences are generally longer - or it could mean that there is more crime but that statistics have been manipulated.
Whichever it is, I mistrust any statistics that have been formulated by any parties that have a vested interest in making the numbers look higher or lower than reality. Depending on who it is, there are advantages to be gained by cooking the books in either direction.