Cultivation of Taccarum

Hello,
 
I've had Taccarum weddellianum since 2005, every year it produces a leaf and usually a "baby" tuber.
But... it doesn't grow in size almost at all, although the tuber very slowly increases, the leaf is 20-30 cm tall every year.
I use regular pot soil, and the plant is fertilized with natural biohumus.
It grows in a southern window.
When it's dormant I store it without soil in the normal room temperature.
 
What do I do wrong? What should I do to make it grow larger?
Here are photos of my plant:
 
Please help,
Marek
 
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