Since when did China widely use paper, which promoted the popularization and development of calligraphy art in China?

Papermaking was invented at the end of the Western Han Dynasty and improved by Cai Lun in the Eastern Han Dynasty. Paper has become a common writing material, and the allusion of "Luoyang paper is expensive" can prove it. In the Tang Dynasty, paper basically replaced other writing materials and was in a privileged position. Paper is easy to roll, carry, absorb water and dry, which promotes the popularization and development of calligraphy art in China.