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Some confusion about size of header-sideinfo mp3

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Counting the number of bits used by the sideinfo, I get 18.8 bytes.
Note that the side info is defined to contain the following parts:
  • main_data_begin (9bits)
  • private_bits (5bits)
  • scalefactor_selection_info (4bits)
  • side_info_granule0(66bits)
  • side_info_granule1(66bits)

I hereby used the option for single channel and the window_switching_flag set --- so region2 is empty and only two regions are coded.
So my question is: why doesn't it add up to 136 bits (17 bytes), as the standard specifies it to be?

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