Statistics showing the number of teachers that leave state funded schools in England in each year can be found in table c1b of the additional tables, available at the following link:
The total number of FTE teachers leaving in any one year includes those who are retiring, those moving to schools elsewhere in the UK, those moving to other education sectors (e.g. Independent schools or further education), those on maternity leave/career break (some of whom do return) and those leaving the profession.
During the same period (2013 to 2014), 44,900 FTE teachers entered service in a state funded school. This is equivalent to 10.3% of teachers. The rate of entry of teachers has been higher than the rate of those leaving throughout the period of 2010 to 2014. In 2014, 14,100 FTE teachers returned to the profession.
These statistics are sourced from the annual School Workforce Census and the next update is scheduled for June 30th 2016.