Caveats: This chart only counts publicly visible mod_dav_svn servers. Private installations, such as those behind corporate firewalls, are not counted. Also, Subversion's other network server, svnserve, is not represented here at all, only because no systematic survey has been made for svnserve. Anecdotal evidence from the Subversion mailing lists and IRC channels indicates that svnserve is about as popular as mod_dav_svn.

In other words, this chart is probably useful for estimating the rate of growth of Subversion's adoption, but not for determining the absolute number of Subversion installations in the world at a given time.

This information is taken from the Security Space Apache Modules Survey. Even though the data is not publicly available, Security Space has agreed to send us monthly statistics for mod_dav_svn. Thanks Security Space!

Date	# Servers
July 2009	334,276
June 2009	406,520
May 2009	407,044
April 2009	408,658
March 2009	390,502
February 2009	378,434
Janurary 2009	368,719
December 2008	330,884
November 2008	299,071
October 2008	268,081
September 2008	254,757
August 2008	307,923
July 2008	294,579
June 2008	286,614
May 2008	269,478
April 2008	255,520
March 2008	240,794
February 2008	221,547
January 2008	199,432
December 2007	187,093
November 2007	180,831
October 2007	169,939
September 2007	159,055
August 2007	155,426
July 2007	137,575
June 2007	133,665
May 2007	117,267
April 2007	103,852
March 2007	95,679
February 2007	84,813
January 2007	77,027
December 2006	68,988
November 2006	63,145
October 2006	54,247
September 2006	46,525
August 2006	40,672
July 2006	38,939
June 2006	35,082
May 2006	33,001
April 2006	29,396
March 2006	26,540
February 2006	23,861
January 2006	21,084
December 2005	20,278
November 2005	18,893
October 2005	17,588
September 2005	15,233
August 2005	13,545
July 2005	12,808
June 2005	11,534
May 2005	9,793
April 2005	8,751
March 2005	7,897
February 2005	6,505
January 2005	5,565
December 2004	4,995
November 2004	4,783
October 2004	4,187
September 2004	4,174
August 2004	3,863
July 2004	2,941
June 2004	2,502
May 2004	2,113
April 2004	1,792
March 2004	1,424
February 2004	1,307
January 2004	1,162
December 2003	1,009
November 2003	969
October 2003	782
September 2003	665
August 2003	522
July 2003	448
June 2003	369
May 2003	308
April 2003	250
March 2003	222
February 2003	158
January 2003	70