season,drift_raw,n_sequences,drift_norm,subtype
2009-10,3.62645,7,0.5,H3N2
2010-11,2.3631968,143,0.0,H3N2
2011-12,1.6731278,73,0.0,H3N2
2012-13,2.983295,1091,0.6707378625869751,H3N2
2013-14,1.8196961,86,0.07503538578748703,H3N2
2014-15,1.5002606,1432,0.0,H3N2
2015-16,1.8078198,1238,0.14465279877185822,H3N2
2016-17,1.6534677,2591,0.07205710560083389,H3N2
2017-18,1.9429207,2414,0.2081940919160843,H3N2
2018-19,2.2726858,3758,0.36329084634780884,H3N2
2019-20,2.3776453,929,0.41265591979026794,H3N2
2020-21,2.8051107,82,0.6137036085128784,H3N2
2021-22,1.032507,5129,0.0,H3N2
2022-23,2.1045096,3827,0.4132714569568634,H3N2
2023-24,2.5358856,5038,0.5795726776123047,H3N2
2024-25,1.1783265,6957,0.056215398013591766,H3N2
2025-26,3.9334888,520,1.0,H3N2