给定一个英文文本，请利用NLP技术提取其中的关键词，并展示它们的出现频次。
- 文本：With its popularity still very much inexhaustible in modern times, we explore the ghostly origins and stories behind London's Theatreland, a West End neighbourhood boasting over 40 venues.
Keywords: popularity, modern times, ghostly origins, stories, London, Theatreland, West End, neighbourhood, venues.

Frequency:
- popularity: 1
- modern times: 1
- ghostly origins: 1
- stories: 1
- London: 1
- Theatreland: 1
- West End: 1
- neighbourhood: 1
- venues: 1