The following table shows the number of students who appeared and passed the annual examinations in four different years from two schools A and B. Study the table and answer the following question:

Years	School A		School B
	Appeared in the exam	Pass in the exam	Appeared in the exam	Pass in the exam
2010	990	708	1000	750
2011	1050	810	1100	805
2012	1120	912	1150	850
2013	1190	1050	1200	1050

Find the difference between the total number of students who appeared in the examination and the total number of students who passed in these four years?