Table 3. Prevalence of participation requirement provisions in defined benefit plans, by industry, September 1, 1974 (in percent)

Table 3. Prevalence of participation requirement provisions in defined benefit plans, by industry, September 1, 1974 (in percent)
Industry	All	With participation requirements	Without participation requirements	Requirements not determinable
Total	100	27	72	1
Manufacturing	100	31	68	1
Mining	100	18	77	6
Construction	100	1	99	0
Transportation	100	17	83	0
Communication and public utilities	100	28	72	0
Wholesale and retail trade	100	39	61	0
Finance, insurance, and real estate	100	48	52	0
Services	100	30	69	1