How Often Does Google Update Its Search Algorithm? The definitive answer to this question is "Always!" It's best to stay in touch with the industry news outlets to know what's going on at any particular time.
Of the 100 most popular searches in the U.S among the top 50 results for each there are only 25 not secure pages that rank. Out of 5,000 pages that only 25 rank as not secure pages. Another perspective is, one half of one percent (.5%) are not secure.