code	Workers scale	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	total	Workers scale	code
1	9 workers or less	43,888	43,532	42,524	39,861	39,412	38,579	36,864	35,940	34,000	32,098	28,133	28,145	28,819	28,296	27,302	27,207	25,670	25,106	25,163	25,755	25,021	24,466	25,852	731,633	9 workers or less	1
2	10-29	40,126	39,543	39,844	37,394	36,799	36,161	35,965	35,595	34,362	33,481	29,788	30,509	31,276	31,454	31,225	31,638	30,602	30,938	31,563	32,871	32,472	33,689	37,982	785,277	10-29	2
3	30-49	18,386	18,634	18,662	17,632	17,929	17,929	17,625	18,204	17,902	18,099	15,774	16,092	16,590	16,777	16,705	17,059	16,903	17,213	17,872	19,084	19,096	19,733	22,109	412,009	30-49	3
4	50-99	16,222	16,166	16,501	15,749	15,944	16,142	16,555	17,021	16,753	16,679	15,201	15,789	16,302	16,294	16,267	16,239	16,231	16,647	17,059	18,451	18,666	19,563	22,511	388,952	50-99	4
5	100-299	15,560	15,112	15,341	14,720	15,515	15,759	16,905	17,821	18,137	18,472	16,544	17,214	17,349	17,399	17,642	17,918	17,822	18,349	18,650	20,241	19,865	21,063	26,068	409,466	100-299	5
6	300 workers or more	6,873	6,987	7,277	6,983	7,337	7,678	9,136	9,717	10,324	10,197	8,712	8,984	9,286	9,356	9,016	9,474	9,083	9,657	10,153	10,927	10,491	12,642	15,396	215,686	300 workers or more	6
0	total	141,055	139,974	140,149	132,339	132,936	132,248	133,050	134,298	131,478	129,026	114,152	116,733	119,622	119,576	118,157	119,535	116,311	117,910	120,460	127,329	125,611	131,156	149,918	2,943,023	total	0

Industrial accidents mean fatal and non-fatal occupational injuries and diseases with work absence of 4 days and more. Data of 2011 year include Industrial accidents caused by Great East Japan Earthquake in 2011.

Data sources:

https://anzeninfo.mhlw.go.jp/user/anzen/tok/anst00.htm