5   open "n9nuance.txt" for output as #2

   10   Midpart=90:Ct9=1

   20   Frontpart=100

   30   while Done=0

   40     N=Frontpart+Midpart+1

   50     if N @ 1991=0 then

   60        :if N>1991 then Done=1:print #2,N:endif

   70     if Done then print Ct9

   80     Frontpart=Frontpart*10

   90     Midpart=(Midpart+9)*10:Ct9=Ct9+1

  100   wend

  110   close #2

finds 182 9's.

The number N is definitely 184 digits long, with 182 9's:

1999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999991