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As requested, numbers from WorldCat, the 1 May 2013 Research snapshot, with 296,589,450 records:

NO. of Recs ISBNs Percent

230402772  0 77.68%
 58861390  2 19.85%
  4269211  4  1.44%
  1659221  1  0.56%
   515674  6  0.17%
   466645  3  0.16%
   151133  8  0.05%
    84572  5  0.03%
    51967 10  0.02%
    33372 12  0.01%

Keep in mind that WorldCat, being the largest library union database in the world, includes a great deal of material that pre-dates the establishment of the ISBN.
Roy

From: Shlomo Sanders <[log in to unmask]<mailto:[log in to unmask]>>
Reply-To: Bibliographic Framework Transition Initiative Forum <[log in to unmask]<mailto:[log in to unmask]>>
Date: Monday, May 20, 2013 5/20/13  6:19 AM
To: "[log in to unmask]<mailto:[log in to unmask]>" <[log in to unmask]<mailto:[log in to unmask]>>
Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records

From a large sample of data that we get from publishers:

  *   Only 24.5% with one ISBN!
  *   40% with multiple ISBNs!
  *   Largest group has no ISBN!


ISBN Count      Percentage of records with X ISBNs
0       38.57%
1       24.49%
2       17.00%
3       5.88%
4       10.77%
5       2.14%
6       0.65%
7       0.09%
8       0.12%
9       0.24%
10      0.04%


Thanks,
Shlomo

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-----Original Message-----
From: Bibliographic Framework Transition Initiative Forum [mailto:[log in to unmask]] On Behalf Of J. McRee Elrod
Sent: Sunday, May 19, 2013 20:34
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [BIBFRAME] Instance of ISBNs in MARC records

In SLC's database of over 300,000 records, over 169,000 have no ISBN, over 114,000 have one, over 19,000 have two, and the number of ISBNs ranges up to 36 in one record.

For us, Instances can't be based on ISBNs.


Total Records: 315389

020s  Records

00 169021
01 114221
02  19745
03   7403
04   3238
05   1149
06    344
07    118
08     29
09     42
10     11
11     16
12     10
13     12
14      4
15      5
16      3
17      7
18      1
19      1
21      1
22      1
23      1
25      3
27      1
28      1
36      1



   __       __   J. McRee (Mac) Elrod ([log in to unmask]<mailto:[log in to unmask]>)
  {__  |   /     Special Libraries Cataloguing   HTTP://www.slc.bc.ca/
  ___} |__ \__________________________________________________________