Immigration to the United States: historical evolution

Reference 1: Average per year.

Reference 2: 1900–09, 1910–19, 1920–29, 1930–39, 1940–49, 1950–59, 1960–69, 1970–79, 1980–89, 1990–99, 2000–09 and 2010–15.

Source: http://en.wikipedia.org/wiki/Immigration_to_the_United_States