The figures above include regular Patch Tuesday updates, but any out-of-band updates issued by Microsoft. So far this year there has been just one such update, in October. Youll see that the numbers have remained relatively consistent over the last three years. For Windows, the easiest way to stay up-to-date is to enable Automatic Updates. You can find the 2006 chart here and the 2007 chart here. You may have seen the recent Microsoft Security Advisory (961051) relating to a vulnerability found in Internet Explorer.”]
Source: https://securelist.com/a-patch-is-not-just-for-christmas/30473/