As of 2015, how many Presidents of China have been conferred with the Pakistan’s highest civilian award Nishan-e-Pakistan?

In April 2015, Pakistan President Mamnoon Hussain conferred the country’s top civil award Nishan-i-Pakistan on Chinese President Xi Jinping. President Xi was decorated with Nishan-i-Pakistan for his “outstanding contribution in the promotion of the relationship between the two countries”. He is the third Chinese leader who has been awarded the Nishan-i-Pakistan. The other two recipients are Premier Li Peng and President Hu Jintao.