  A statistical analysis of the impact of the diminishing number of operational
shutters experienced by the JWST/NIRSpec Micro Shutter Array since
Commissioning is presented. It is shown that the number of high priority
science targets that NIRSpec is able to observe simultaneously has so far
decreased by 3.1%. Of greater concern, however, is NIRSpec's diminished ability
to carry out autonomous MSATA target acquisition, which is more sensitive to
the loss of shutters than is the multiplexing. In the flagship case of MSA
observations of deep fields, the number of pointings at which it is not
possible to reach the required minimum number of 5 Valid Reference Stars has
increased from 4.9% to 6.3% and is beginning to become noticeable. Similarly,
the number of higher risk target acquisitions that need to be carried out with
fewer than the maximum allowed number of 8 Reference Stars has grown from 27%
to 31%.
