Bitcoin searchs down to zero at Google trends, why this is happening?

Hi guys, i was reading about big data and his applications so i end up checking my top trends in google, then i find this:

Google Trends shows a graph where Bitcoin searchs goes to zero. Referal link

It seems quite peculiar to me, some one knows why is this happening? Is also interesting to me to see China as the region where most people look fot Bitcoin Cash.

I'll be glad to know what you think.
@pseudonym