Table:
text: Ludmannsdorf
Population
Population
Village_German Village_Slovene Number_of_people_1991 Percent_of_Slovenes_1991 Percent_of_Slovenes_1951
Bach Potok 104 15.4% 98.6%
Edling Kajzaze 191 27.2% 96.3%
Fellersdorf Bilnjovs 52 36.5% 83.8%
Franzendorf Branča vas 164 23.8% 63.8%
Großkleinberg Mala gora 41 36.6% 100%
Ludmannsdorf Bilčovs 150 50.7% 88.3%
Lukowitz Koviče 91 12.1% 60.4%
Moschenitzen Moščenica 50 98.0% 100%
Muschkau Muškava 88 18.2% 94.0%
Niederdörfl Spodnja vesca 98 13.3% 55.3%
Oberdörfl Zgornja vesca 121 27.3% 46.5%
Pugrad Podgrad 132 28,8% 37.8%
Rupertiberg Na gori 57 33.3% 55.4%
Selkach Želuče 99 57.6% 84.3%
Strein Stranje 30 60.0% 100%
Wellersdorf Velinja vas 115 40.0% 88.0%
Zedras Sodraževa 16 25.0% 68.3%

Question: How many people in Ludmannsdorf have a village Rupertiberg in 1991?