id%1E6    count missing   missing%
 2000000     41    4    9.76%
 3000000    127    2    1.57%
 4000000    419   11    2.63%
 5000000    382    4    1.05%
 6000000    986   27    2.74%
 7000000   2111   16    0.76%
 8000000   2370   19    0.80%
 9000000   6669  152    2.28%
10000000   8020  160    2.00%
11000000   6368  135    2.12%
12000000  28300  542    1.92%
13000000  38825  738    1.90%
14000000  37431  841    2.25%
15000000  33768  744    2.20%
16000000  37844  913    2.41%
17000000  32380  727    2.25%
18000000  28422  523    1.84%
19000000  28027  518    1.85%
20000000  28677  470    1.64%
21000000  33549  282    0.84%
22000000  45843  494    1.08%
23000000  41435  661    1.60%
24000000  44835  643    1.43%
25000000  69127 1281    1.85%
26000000  90092 2491    2.76%
27000000 113346 4165    3.67%
28000000  18347 3570   19.46%