Depends on the definition of shortage.

The shortage to achieve full pool might only be 20% caused by invaders.

The shortage difference to achieve a normal or acceptable level is 100% due to the millions of invaders.

Still, the managers carry full blame for the current crisis. The current situation was very predictable more than 20 years ago, but they did NOTHING to reduce the outflow. The fix would have been so small as to a non-issue. Now, there is a crisis. No doubt, that was the goal all along.