In 1974, Chiang Ching-kuo implemented the Ten Major Construction Projects, the beginning foundations that helped Taiwan transform into its current export driven economy. Since the 1990s, a number of Taiwan-based technology firms have expanded their reach around the world. Well-known international technology companies headquartered in Taiwan include personal computer manufacturers Acer Inc. and Asus, mobile phone maker HTC, as well as electronics manufacturing giant Foxconn, which makes products for Apple, Amazon, and Microsoft. Computex Taipei is a major computer expo, held since 1981.