1870-4670 1870-4670 S1870-46702020000200175 10.22201/iij.24487899e.2020.37.14867 Mexico 00 12 2020 00 12 2020 31 175 199

1991 7a 1984 3 2019 2019 Inegi 2019 OIT 2014 OIT 2014 2002 OIT 2007 1999