query: SELECT YEAR ,  avg(attendance) FROM home_game GROUP BY YEAR;
question: For each year, are returning that year and that average number of attendance at home game.
query_toks: SELECT YEAR , avg ( attendance ) FROM home_game GROUP BY YEAR ;
query_toks_no_value: select year , avg ( attendance ) from home_game group by year
question_toks: For each year, are returning that year and that average number of attendance at home game.