Huh? Chavismo began in 1999. So if you're claiming that chavismo caused a lot of migration, you'd need to come up with data that correlates with that time period.
The reality is, the big migrations from Venezuela began in 2017, which correlates with the very harsh economic sanctions imposed by the U.S. on Venezuela, which caused a hyper-inflation that lasted too long.
It has nothing to do with Chavismo and everything to do with American economic terrorism.