请问：关于mycasetracker# Immigration - 落地生根
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1. RD at 2015-01-05 and Form I485， SRC： In Process: 256 (55.7%)
2. RD at 2015-02-02 and Form I485， SRC: In Process: 252 (41.3%)
3. RD at 2015-03-02 and Form I485, SRC: In Process: 87 (17.3%)
4. RD at 2015-04-01 and Form I485, SRC: In Process: 91 (26.6%)
5. RD at 2015-05-01 and Form I485, SRC: In Process: 299 (48.1%)
请问怎么1月和2月反而比3，4月还多这么多啊？
1. RD at 2015-01-05 and Form I485， SRC： In Process: 256 (55.7%)
2. RD at 2015-02-02 and Form I485， SRC: In Process: 252 (41.3%)
3. RD at 2015-03-02 and Form I485, SRC: In Process: 87 (17.3%)
4. RD at 2015-04-01 and Form I485, SRC: In Process: 91 (26.6%)
5. RD at 2015-05-01 and Form I485, SRC: In Process: 299 (48.1%)
请问怎么1月和2月反而比3，4月还多这么多啊？