Table:
industry
share of employment
share of gross output

percent

mining and oil and gas extraction
16.54
43.67

utilities
8.95
47.56

construction
4.33
20.18

manufacturing
17.21
48.11

wholesale and retail trade
7.27
29.16

transportation and warehousing
5.31
31.46

information and culture
6.46
25.29

broadcasting and telecommunications
12.70
36.86

finance, insurance and real estate
3.81
27.22

arts, entertainment and recreation
5.27
37.11

accommodation and food services
2.23
7.68

other services
4.59
21.23

all
7.89
31.29

Statement: frontier firms accounted for about 30% of gross output in canadian industries for the period of 1991 to 2015.
Question: what was the percent of gross output in canadian industries of frontier firms for the period of 1991 to 2015?
Answer: [31.29]