Letter frequency table including special characters?

Does anyone know a table somewhere for relative frequencies of not only letters, but also punctuation / special characters? I need to use a table to set the letter frequencies for my Huffman code generation algorithm, but for more than half an hour googling I could not find anything that gives a comparison between letters and special characters (I found letter tables and I even found one that compares only special characters, but not comparing them to each other).

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