[ipv6-wg] Why did the Google IPv6 statistics dropped for the Netherlands?

Hello, Is there anyone in this group that would dare to speculate on the sudden drop in IPv6 adoption for my country, the Netherlands on this URL? https://www.google.com/intl/en/ipv6/statistics.html#tab=per-country-ipv6-ado... The drop is best shown here: https://www.vyncke.org/ipv6status/project.php -- Marco