The "space" character had to come before graphics to make sorting easier, so it became position 20hex; for the same reason, many special signs commonly used as separators were placed before digits.
ðə "spˈeɪs" kˈæɹɪktɚ hædtə kˈʌm bᵻfˌoːɹ ɡɹˈæfɪks tə mˌeɪk sˈɔːɹɾɪŋ ˈiːziɚ, sˌoʊ ɪt bɪkˌeɪm pəzˈɪʃən twˈɛnti hˈɛks; fɚðə sˈeɪm ɹˈiːzən, mˈɛni spˈɛʃəl sˈaɪnz kˈɑːmənli jˈuːzd æz sˈɛpɚɹˌeɪɾɚz wɜː plˈeɪst bᵻfˌoːɹ dˈɪdʒɪts.