Query: When was the most prior visit from a Burmese representative to the  United States prior to 2010 ? 
Context: In May 2013, Thein Sein became the first Myanmar president to visit the White House in 47 years; the last Burmese leader to visit the White House was Ne Win in September 1966. President Barack Obama praised the former general for political and economic reforms, and the cessation of tensions between Myanmar and the United States.