Chinese national raw silk output prior to 1840

Chinese raw silk exports increased about twenty-fold from the 1840s to the 1920s, and exports of silk fabrics increased about ten-fold.1 Where were those increases from? Were they mainly from increased sericultural production? Or are they attributable to decreased domestic consumption? Or did they originate from both? If domestic consumption had remained constant, what impact would such an increase in exports have had on Chinese sericultural production? To answer any of these questions, one needs to know the national raw silk output before the 1840s.