CLEAN : Sothebys contemporary auction strongest ever

The video discusses the art sales at Sotheby's in 2014, highlighting a $1.6 billion turnover. It features Francis Bacon's 1977 self-portrait diptych, estimated at £13-18 million, which hasn't been seen since 1993. Additionally, it covers Richter's 1986 abstract painting, valued at £14-18 million, previously exhibited at the Ludwig Museum in Cologne.

In what year was the Francis Bacon diptych sold at Sotheby's?

Where was Richter's painting exhibited for many years?