question: How many years did barclay nordica arrows bmw enter with a bmw str-4 t/c engine with less than 1 point?
answer: SELECT SUM(year) FROM table_name_98 WHERE engine = "bmw str-4 t/c" AND entrant = "barclay nordica arrows bmw" AND points < 1
context: CREATE TABLE table_name_98 (year INTEGER, points VARCHAR, engine VARCHAR, entrant VARCHAR)