Actually, the rate of immigration has decreased over the past several years. The historic high came more than a century ago, in 1890, when immigrants made up 14.8 % of our population. Today, about two-thirds of immigrants are here legally, either as naturalized citizens or as lawful permanent residents, more commonly known as "green card" holders. And of the approximately 10.8 million immigrants who are undocumented, about 40 % arrived legally but overstayed their visas.
As for the flow of undocumented immigrants, the numbers of undocumented people apprehended at the border has been dropping. In fact ,the total number of such apprehensions in 2011 was 340,252, which was the lowest since 1972. The only population of immigrants that has increased in recent years is children entering the country alone. The numbers have increased from 8,041 in 2008 to 24,481 in 2012; the vast majority of these kids are fleeing the horrific gang violence and extreme poverty in Central America. An interesting fact is that in 2013, the net migration between the United States and Mexico was toward Mexico for the first time ever.