Like most things in life, there are many variable factors that drive mass migration. People don't typically leave their homes and risk their lives unless there is something driving them to flee from life in their own country. Some of those factors include: political, economic, and humanitarian crises. Poverty, disease, crime, violence, and corruption all motivate people to flee their home countries.
Because of these variables and a great many others, statistic will vary up and down rather dramatically at times. None of that matters to those that only see political enemies to blame for every ill. It does serve to keep them busy on forums, social media, and TV, however.
* By the way... speaking of political crises. In case of another ugly mob attack on the Capitol, how difficult is it for a U.S. citizen to immigrate to live with our friends to the north in Canada?