Table:
2013
2010
2007
2004

volunteer rate

total population
29,188
28,206
27,000
26,021

number of volunteers
12,716
13,249
12,444
11,773

volunteer rate
44
47
46
45

volunteer hours

total annual volunteer hours
1,957
2,063
2,062
1,978

average annual volunteer hours
154
156
166
168

Statement: in 2013, volunteers devoted about 1.96 billion hours to their volunteer activities.
Question: how many hours did volunteers devote to their volunteer activities in 2013?
Answer: [1957.0]