According to the 2010 United States Census, nearly 3% of people who self-identified as black had recent ancestors who immigrated from another country. Self-reported West Indian American, mostly from Jamaica and Haiti, represented 0.9% of the US population, at 2.6 million. Self-reported black immigrants from Sub-Saharan Africa also represented 0.9%, at about 2.8 million. Additionally, self-identified Black Hispanic and Latino Americans represented 0.4% of the United States population, at about 1.2 million people, largely found within the Puerto Rican and Dominican communities. Self-reported black immigrants hailing from other countries in the Americas, such as Brazil and Canada, as well as several European countries, represented less than 0.1% of the population. Mixed-Race Hispanic and non-Hispanic Americans who identified as being part black, represented 0.9% of the population. Of the 12.6% of United States residents who identified as black, around 10.3% were "native black American" or ethnic African Americans, who are direct descendants of West/Central Africans brought to the U.S. as slaves. These individuals make up well over 80% of all blacks in the country. When including Multiracial American, about 13.5% of the US population self-identified as black or "mixed with black". However, according to the U.S. census bureau, evidence from the 2000 Census indicates that many African and Caribbean immigrant ethnic groups do not identify as "Black, African Am., or Negro". Instead, they wrote in their own respective ethnic groups in the "Some Other Race" write-in entry. As a result, the census bureau devised a new, separate "African American" ethnic group category in 2010 for ethnic African Americans.
Question: How many more millions of people self-reported black immigrants from Sub-Saharan Africa compared to those self-reported West Indian American?
Answer: .2