求翻译：种种原因所致，中等职业学校教育的招生数和在校生数量几年内锐减，1998年到2001年中等职业学校招生数由520万减少到398万，在校生数由1431万人减少到1164万。是什么意思？

Due to various reasons, education in secondary vocational school of sharp decline in the number and the number of students enrolled in years, from 1998 to 2001 number of enrolment in secondary vocational schools decreased from 5.2 million to 3.98 million, number of students from 14.31 million were reduced to four.