Essentially, with the fall of the pro-Soviet regime, religious liberties also started to fall. Under the Taliban, for example, as was mentioned by Mr. Kang, there were identifications required for Sikh homes, on Sikh persons, so whoever could leave essentially spent whatever money they could and they left. What you're left with now are those who are so poor or so destitute that they just don't have the means to go anywhere. As the situation has become worse, the ability to leave is also decreasing, as the pressure on that community, the persecution they face, is actually increasing.
On July 18th, 2016. See this statement in context.