the afghan opium trade

i noticed this story about the opium trade in afghanistan and spotted something a little odd. its well known that opium production is at an all time high but take a look at the graph for production going back ten years in this story

notice that in 2001, there was barely any metric tonnes produced (compared to over 6000 last year). the article says...

After the fall of the Taleban in 2001, the market has been raided several times but it has re-opened again and again.

now, the taleban didn't 'fall' in afghanistan until october of 2001 - 1 full month after sept 11th, so how come there was so little opium produced that year when there were 10 months gone by before they were at war? it was the taleban that allowed the poppies to be grown and the amount produced had been rising so why the discrepancy in 2001?