No one knew how China would turn out back in the 70s, and Deng was more milder, if that's the right word to use. No one wanted a third world war so it made sense for the world to work together back then. Sadly things didn't pan out as expected...
The trend is to buy NMIC now but I think the % of MIC particularly the low end bargain goods are still pretty high, likewise don't have a figure either.