Until 2015, there were only French orders for the Rafale. Even with the three orders in 2015 (Egypt, India, Qatar), there was no big interest in increasing the rate of 11 aircraft per year (staff holidays in August), at the risk of discontinuity of the production line.
It was only from 2021 orders that there was no longer any risk of discontinuity in the production line. With the orders obtained since then, and if new ones arrive, it becomes possible to increase this rate.
In addition, the table provided by H_K above shows that deliveries sometimes exceeded eleven devices per year in certain years, which necessarily implies an increase in production rates, even if slight::
We have a delivery rate of 6 in 2004 (start of delivery of Rafale F2, after deliveries of 10 Rafale F1 to the French Navy between 1999 and 2003), 10 in 2005, 15 in 2006, 13 in 2007, 14 in 2008 and 2009, before dropping back to the normal rate of 11 from 2010 to 2014, then dropping to 8 in 2015, 9 in 2016 and 2017, and then go up to 12 in 2018,
26 in 2019, 13 in 2020,
25 in 2021 and 14 in 2022.
And as we can see, without a doubling of production, it would have been impossible for Dassault to ensure such a quantity of deliveries in 2019 and 2021...