How many papers were preprinted between the years 1990 and 2000?
years 1990 and 2000 refers to Year BETWEEN '1990' AND '2000'; papers refers to COUNT(id)
SELECT COUNT(id) FROM Paper WHERE Year BETWEEN '1990' AND '2000' AND ConferenceId = 0 AND JournalId = 0
database name:db_id authors
Author table Author Cols: Id dtype integer, Name dtype text, Affiliation dtype text, 
Conference table Conference Cols: Id dtype integer, ShortName dtype text, FullName dtype text, HomePage dtype text, 
Journal table Journal Cols: Id dtype integer, ShortName dtype text, FullName dtype text, HomePage dtype text, 
Paper table Paper Cols: Id dtype integer, Title dtype text, Year dtype integer, ConferenceId dtype integer, JournalId dtype integer, Keyword dtype text, 
PaperAuthor table PaperAuthor Cols: PaperId dtype integer, AuthorId dtype integer, Name dtype text, Affiliation dtype text, 
