Table 13. Cross-validation performance of our ensemble model per year.

Year	Weighted F1-score	Support
2000	0.497	1,658,715
2006	0.491	1,852,645
2009	0.558	225,416
2012	0.487	1,971,812
2015	0.588	265,830
2016	0.632	65,235
2018	0.481	2,057,306
2019	0.535	180
Average	0.489	1,012,142
Standard deviation	0.135	882,783