From the image below you can see that the results are near 226, 000 URLs. Google search.
Update 10:42 EST: I've identified a few other domains that are similar to the injection files.The consistency and similarities of the files details that the injection attacks started in 2010.
hxxp://alexblane.com/ur.php
hxxp://sol-stats.info/ur.php
hxxp://online-stats201.info/ur.php
hxxp://stats-master111.info/ur.php
hxxp://agasi-story.info/ur.php
hxxp://general-st.info/ur.php
hxxp://extra-service.info/ur.php
hxxp://pop-stats.info/ur.php
hxxp://star-stats.info/ur.php
hxxp://multi-stats.info/ur.php