Unfortunately most sources are in Dutch but for good measure I will explain the most important data points: 1. Total weekly new covid infections come from the RIVM (dutch official body): https://www.rivm.nl/coronavirus-covid-19/archief-corona-updates 2. For the week of 26 jan, it is mentioned in an article by the RIVM that over one third of the current new infections is of the British Variant: https://www.rivm.nl/nieuws/Britse-variant-wint-terrein-in-Nederland 3. The same article mentions the rate was 8.6% in the period of 4-10 jan These are the most important points, and already show the trend. However, here are the additional sources: 4. In 'early december' the rate was about 1% according to this article on the largest news site of the country: https://www.nu.nl/coronavirus/6101869/wat-weten-we-nu-van-de-britse-coronavariant-ja-die-is-echt-besmettelijker.html 5. In a national press conference on 12 Jan, the minister of health indicated that in the past period the rate was between 2-5%. More frequent updates confirmed that there was steady growth in this period, so for the period between 9 and 29 december, there was likely growth from about 2% to about 5%. This could be off by one or two percentage points. 6. Though there was no clear source, several news sites recently referred to a current rate of 20%, this was likely observed between 13 and 19 jan.
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