Source:
http://www.dhs.gov/xlibrary/assets/CISOMB_Annual_Report_2007.pdf
As of May 2007, USCIS reported a staggering 329,160 FBI name check cases pending, with approximately 64 percent (211,341) of those cases pending more than 90 days and approximately 32 percent (106,738) pending more than one year.
< 3 months 117,819 35.8%
3 - 6 months 55,749 16.9%
6 - 9 months 28,029 8.5%
9 - 12 months 20,825 6.3%
12 - 15 months 14,133 4.3%
15 - 18 months 13,931 4.2%
18 - 21 months 11,035 3.4%
21 - 24 months 12,398 3.8%
24 -27 months 11,765 3.6%
27 - 30 months 6,600 2.0%
30 - 33 months 5,732 1.7%
>33 months 31,144 9.5%
Total 329,160
Please note the above data is based on world-wide.
Situation for China will be much morse