Intro
Ahmadis lie about their census all the time.  They do this as a marketing ploy, they try to keep their flock of adherents paying and volunteering, this way, the money keeps rolling in.  In the subsequent scans, Mirza Nasir Ahmad admits that by 1974, there were barely 500k Ahmadis in the whole world.

The scans from Mirza Nasir Ahmad’s testimony
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Conclusions

1.  In 1908, there were scarcely 18,000 Ahmadis.  However, MGA lied and wrote over 400k.

2.  In 1921, there were 30,000 Ahmadis.

3.  By 1931, there were 56,000 Ahmadis.

4.  By 1974, there were barely 500k Ahmadis in the whole world.