Commercial fleet data is one of my jobs.

Orders/deliveries through to the end of March 2015:
A320:
Sales: 11,581
Deliveries: 6,494
In operation: 6,231
Unfilled orders: 5,087
737:
Sales: 12,715
Deliveries: 8,471
In operation: 6,114
Unfilled orders: 4,244
Both the single-aisles will be produced out past 2025 by Airbus and Boeing, maybe out to 2030 before their replacements are introduced. Upgraded versions are coming. A320neo is due to enter service this year, 737 MAX in 2017.
Production rates have gone up about 50% over the past four years, which is staggering. They're going to go much higher as well - Airbus is building an A320 plant in Mobile, Alabama, and Boeing is adding a new line at Renton for the 737 MAX.
Airbus is going from 42 to 50 A320s per month from 1Q 2017, and will have capacity to go to 56-58 in 2018.
Boeing is going from 42 to 52 per month by 2018, and will have capacity to get Renton to 63 per month.
So, by 2018, they're going to be pumping out about 1250 single-aisles a year.
Oh, and get ready to be more squeezed. Boeing is upping its 737 max seating from 189 to 200. Airbus is taking the A320 from 180 to 189, possibly 192. They're also developing a version of the A321neo to replace the 757, so you can look forward to 6+ hours in a narrowbody.
