At the end of 2018, the HTTP Archive changed the source of the URLs…Looking at the data from Dec 2018 onwards:

client	year	total	`www`	percent
desktop	2022	1,246,032	511,012	41.01%
desktop	2021	5,824,858	2,508,805	43.07%
desktop	2020	6,018,707	2,716,807	45.14%
desktop	2019	4,291,086	2,086,970	48.64%
desktop	2018	3,840,067	1,815,773	47.28%
mobile	2022	1,613,142	651,794	40.41%
mobile	2021	7,957,652	3,350,268	42.10%
mobile	2020	7,157,942	3,203,779	44.76%
mobile	2019	5,181,871	2,490,108	48.05%
mobile	2018	1,247,333	286,662	22.98%

[The 2018 → 2022 numbers seem clear, however: www is going out of fashion, at a remarkable rate of 2% a year—at least for ‘desktop’ (47% → 41%).]