Which pronoun is most likely to NOT have an antecedent?

Which pronoun is most likely to NOT have an antecedent?
we
26  52%
such
10  20%
this
9  18%
which
5  10%

Number of Voters  :  50
First Vote  :  Saturday, July 27, 2024 10:43 AM
Last Vote  :  Thursday, August 29, 2024 04:45 AM