1992
There is a very cool film loop from the NOAA showing the progression of the night sky in China from 1992 to 2010. You can watch the full animation here. Above is a photo of 1992 and here is 2010. (Pics)
2010
One interesting follow-on observation as made by Jon Belk on Twitter. Note how there’s been literally no change to North Korea in this time.
North Korea
Via Business Insider