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select * into t from (values (1, 2017), (2, 2017), (1, 2018), (2, 2018), (3, 2018), (4, 2019), (3, 2019), (1, 2019) ) v(id, year)
8 rows affected
select year, count(*) from (select t.*, row_number() over (partition by id order by year) as seqnum_id, dense_rank() over (order by year) as seqnum_year from t ) t where seqnum_id = seqnum_year group by year;
year
(No column name)
2017
2
2018
2
2019
1