 <translate> Context: Capita was formed 1984 as a division of the non-profit CIPFA (Chartered Institute of Public Finance and Accountancy). In 1987 it became an independent company with 33 staff as a result of a management buy-out, led by Rod Aldridge, and was first listed on the London Stock Exchange in 1991.

Question: when was capita fully listed as a public company on the london stock exchange?
Steam of consciousness below:
 <yor> Àyíká: A dá Capita sílẹ̀ ní ọdún 1984 gẹ́gẹ́ bí ẹ̀ka kan ti àjọ tí kì í ṣe ti èrè CIPFA (Chartered Institute of Public Finance and Accountancy). Ni ọdun 1987 o di ile-iṣẹ ominira pẹlu awọn oṣiṣẹ 33 bi abajade ti rira iṣakoso, ti o jẹ olori nipasẹ Rod Aldridge, ati pe o kọkọ ṣe akojọ lori Iṣowo Iṣowo Ilu London ni ọdun 1991.  Ìbéèrè: ìgbà wo ni capita ti wà ní àkọsílẹ̀ gẹ́gẹ́ bí ilé-iṣẹ́ tó wà ní àkọsílẹ̀ ní London Stock Exchange? Ìrì ìmọ̀lára ní ìsàlẹ̀: 