After looking at several records, it appears that Hispanics have a superscript 0 after the 'W' for white. Hispanic, strictly speaking, is not a race as people from Central and South America have different percentages of spanish, indigenous and in some cases african ancestry. I wonder how it came to be regarded as one in the US (I'm not american).
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It isn't treated as a race in the US either, it's a separate question (so people can identify as white and Hispanic, or black and Hispanic, or other combinations).