China has churned out more SSNs in less than 3 years than she had been over the past 3 decades. From the past <3 years, we've also seen that Huludao Shipyard is able to achieve a stable annual production (or shall I say, launch) rate of 3 boats for the past two years.
If such a production/launch rate can be maintain for the coming years:
Submarines per year | 3 boats/year | Alternating (3-4 boats/year) | 4 boats/year |
1 decade (10 years) | 30 | 35 | 40 |
2 decades (20 years) | 60 | 70 | 80 |
(For reference, the US regularly launched 3-4 Los Angeles SSNs per year throughout the Cold War.)
Moreover, per one of my previous analyses in the Miscellaneous News thread - Even by using only half of the construction bays available at the eastern site of Huludao, that would mean an annual production/launch rate of 5 boats per year (4x SSNs + 1x SSBN/SSGN or 3x SSNs + 2x SSBN/SSGNs).
Depending on the actual needs of the PLAN, that number could actually be higher.
Besides, it is also entirely conceivable that the PLAN would surge the number of SSNs initially (in order to achieve regional parity with (or even regional superiority against) the US&LC's present and anticipated submarine forces in the WestPac as soon as possible, for instance), before settling on a slightly lower but more stable SSN production/launch rate later on.
Of course, this also depends on whether the PLAN considers the SSK (and also the long-rumored SSK-N) as part of their overall equation...