refs 4628 add start method to calculate ndl statistics
refs 4628 add start method to calculate ndl statistics

MiraitSystems/enju_trunk_ndl_statistics,MiraitSystems/enju_trunk_statistics,MiraitSystems/enju_trunk_statistics,MiraitSystems/enju_trunk_statistics,MiraitSystems/enju_trunk_ndl_statistics,MiraitSystems/enju_trunk_ndl_statistics