请教：employed persons 和 staff and works 究竟是什么关系啊

我很穷，但我依然需要帮助：）
我在帮我导师助做一个中国历史就业方面的课题，对以下的分类很是困惑。employed persons 和 staff and works 究竟是什么关系啊？如果有规范的定义就更谢谢了！

我没有能拿出手的悬赏， 但作为回报，我可以帮你在美国大学数字图书馆上找一些你需要的资料。 谢谢了！
下面是截取的一个图表：

BeiJin	Index:  CHINADATAONLINE -China statistics - provincal statistics -section population  and employment
Year	Total Number of Employed Persons(10000 persons)	Employed Persons by		Employed Persons by Industry	Staffand Workers(10000 persons)
	Urban and Rural Areas	Primary Industry(10000 persons)	Secondary Industry(10000 persons)	Tertiary Industry(10000 persons)		State-owned Units(10000 persons)	Urban Collective Owned Units(10000 persons)	Other Ownership Units(10000 persons)
	UrbanAreas(10000 persons)		RuralAreas(10000  persons)
1949		43.34					31.86	12.22		19.64
1983	552.03	367.41	184.63	117.14	240.21	194.67	371.95	303.43	68.52
1984	566.49	377.6	188.89	106.66	246.55	213.29	375.42	302.45	71.65	1.32
1985	574.79	384.77	190.01	97.13	254.29	223.37	382.3	308.05	72.65	1.61
1986	590.04	400.5	189.55	93.34	260.79	235.91	397.86	324.37	71.14	2.35
1987	598.17	408.33	189.84	91.8	264.09	242.28	405.22	331.79	70.67	2.76
1988	584.09	413.92	170.16	88.42	267.56	228.11	410.42	336.42	69.95	4.05
1989	593.9	424	169.9	91.1	266.2	236.6	418.35	343.75	67.38	7.22
1990	627.1	461.23	165.87	90.7	281.6	254.8	454.91	357.93	86.75	10.23

employed persons   USe term for an individual 16 years old or older who, in a given week, (a) works minimum one hour for an emolument or minimum 15 hours of unpaid work in a family business, or (b) who is not working but has a job or business from which he or she is temporarily absent, whether or not being paid for the time off.，
staff and works   受雇于政府和企业的工作人员，

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tks.................