Space debris mitigation is one of the French Space Operations Act objectives, through the removal of non-operational objects from populated regions. At the end of their mission, space objects are to be placed on orbits that will reduce collision hazards with other spacecraft or debris. This paper presents our investigations on mitigation guidelines compliance in Low Earth Orbit (LEO) by space operators from 2000 to 2013. We are particularly interested in studying the expected decrease of the mid- and long-term collision risk in LEO, through the application of the 25 years rule or the reaching of a graveyard orbit above this region. We have identified space objects ending their mission during the period of interest and estimated their orbital lifetime. We obtain a global compliance rate and analyze its evolution over a 14 years period.