As of block height 1169864, the command output_histogram from the daemon gives me the following result:

output_histogram 3 0.000929635403 3 0.003483702322 3 0.003483172627 3 14.170000000000 3 14.110000000000 3 14.060000000000 3 14.050000000000 ... 2224 0.000510000000 2229 0.000970000000 2232 0.000420000000 2258 0.000410000000 2266 0.000860000000 2270 0.000750000000 3548 2000.000000000000 5022 800.000000000000 5025 700.000000000000 5952 600.000000000000 ... 905471 10.000000000000 907961 0.300000000000 939427 0.100000000000 1071303 0.500000000000 1204368 0.200000000000

Why are the amounts with instances of 2270 or less not in denomination?