I've now updated the spreadsheet with the new 2013 Yearbook data, therefore it now contains 26 years of statistics.
As before, there are two files for download, the second being the more useful one to most of you.
Yearbook Stats 1988 - 2013:
https://drive.google.com/file/d/0B_bzL2A4XRioU2tSLWlXODBmOW8
MIRROR #1: http://dfiles.eu/files/8gmowa0u9
MIRROR #2: http://www.fileflyer.com/view/MSqBQAs
MIRROR #3: http://www.fileswap.com/dl/dz0k38QrjR/
MIRROR #4: http://www.sendspace.com/file/qgngj0
As before, the second .xls file has each statistic field in a separate tab with each year in a column, and is far more useful for year-by-year graphs etc. I've also included the additional sheets on the end, giving examples of the sorts of calculations that are possible with the data (e.g. Bible Studies per Publisher).
Yearbook Stats by Field 1988 - 2013:
https://drive.google.com/file/d/0B_bzL2A4XRiodUs1bmQyNlJVZG8
MIRROR #1: http://dfiles.eu/files/1nqmvzpfh
MIRROR #2: http://www.fileflyer.com/view/MSqBQAs
MIRROR #3: http://www.fileswap.com/dl/OaJKghTz7x/
MIRROR #4: http://www.sendspace.com/file/6409gg