Why Advani did not bring black money in Swiss bank when he was in power?

This is the question asked by all the senior congress leaders including Sonia Gandhi and Rahul Gandhi.

Around two years back, Swiss government disclosed the money they had from different countries. They are ready to disclose the account details of the account holders to the government of their respective countries. To get the account details of all the indians, Indian government has to formally ask Swiss government for the details. Few years back, this was not possible, and previous governments could not have done anything in this case.

Instead of asking Swiss government for the details, Congress leaders are criticizing Advani and other leaders for not doing anything when they were in power.