Within the year of 2001 to 2010, find the paper published rate of 2001.
year of 2001 to 2010 refers to Year BETWEEN 2001 AND 2010; Percentage = Divide(Count (PaperId(Year = 2001)), Count (PaperID(Year BETWEEN 2001 AND 2010))) * 100
SELECT CAST(SUM(CASE WHEN Year = 2001 THEN 1 ELSE 0 END) AS REAL) / COUNT(Id) FROM Paper WHERE Year >= 2001 AND Year < 2011