From an Economist article in 2015: https://www.economist.com/leaders/2015/ ... e-in-china
In 1990 it produced less than 3% of global manufacturing output by value; its share now is nearly a quarter. China produces about 80% of the world’s air-conditioners, 70% of its mobile phones and 60% of its shoes. The white heat of China’s ascent has forged supply chains that reach deep into South-East Asia. This “Factory Asia” now makes almost half the world’s goods.
I'd think it was a pretty safe bet for the overall percentage of goods to have gone up since 2015 for South East Asia as a whole, though shoes and apparel have been steadily migrating out of China, specifically and to places like Vietnam.... specifics aside I understand the point of the question.
Looking over my work for the past 20 years I think the percentage of products I've worked on that have gone to market that are made in Asia is north of 80%. I've been to Asia on development trips about 20 times or so and seen a variety of conditions. It is a fact of making things often times in the modern world. In 2017 I worked on a design project for a start up (branding, positioning, strategy, industrial design, early stages of DFM). The two founders, both of whom emigrated to the United States, were determined to make their product in the US. After working with several US contract manufacturers and researching starting their own assembly factory in the US they came to the conclusion that the risk, cost, time-to-market, MOQs were all too high and the quality too low to make this product in the US at anything near a competitive price. So development moved to Asia. I've been a part of several project where local manufacturing has been explored, if not in the US, then in Mexico or Canada. Each one moved to Asia for production to hit price, quality, and time-to-market targets.... again, this is just my experience. I know some folks on here have had the experience of manufacturing stateside.