Why is Singapore not rated on the SPI

Why is Timor-Leste, Vietnam and also Singapore "not ranked" on the Social Progress Index (SPI) [1]?
It would be very useful to see the required data in the SPI as I'm in the process of creating a ethical business in Asia. Coming from #3 and living in #92 for a while makes me believe that Singapore must be somewhere in between.

Thank you very much.

[1] https://en.wikipedia.org/wiki/List_of_countries_by_Social_Progress_Index

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