In 2020, production of the PAC-3 Configuration 3 was discontinued, and only the PAC-3 MSE is now being produced. With the introduction of the PAC-3 MSE, the PAC-3 variant was renamed PAC-3 CRI. CRI stands for Cost Reduction Initiative.
So basically the capacity gained by the discontinuation of the production of the PAC-3 (PAC-3 CRI) was used to ramp up the production of the PAC-3 MSE.
What happened on 2019 that made them ramp up production?
https://de.wikipedia.org/wiki/MIM-104_Patriot
So basically the capacity gained by the discontinuation of the production of the PAC-3 (PAC-3 CRI) was used to ramp up the production of the PAC-3 MSE.
https://en.wikipedia.org/wiki/Abqaiq–Khurais_attack
https://en.wikipedia.org/wiki/2019–2021_Persian_Gulf_crisis
https://en.wikipedia.org/wiki/Hwasong-11A
https://en.wikipedia.org/wiki/Intermediate-Range_Nuclear_Forces_Treaty
Those are the four big ones.