Fast growth in the number of worker centers, 1980–2018

1980 4
1985 15
1990 21
1995 35
2000 65
2005 102
2010 153
2015 194
2018 226

Source: Computed from Fine, Narro, and Barnes 2018, p. 14, Fig. 2.

View the underlying data on epi.org.