This is the 14134th most frequent German word.
gestiegene
"Gestiegene" means "increased" in English.
Here 'gestiegene' is used as a past participle adjective derived from the verb 'steigen', describing higher temperatures as a result of increase.
Die gestiegenen Temperaturen im Sommer sind ein großes Problem.
The increased temperatures in summer are a big problem.
In this case, 'gestiegene' modifies 'Nachfrage' to indicate demand experienced a rise.
Das Unternehmen hat durch gestiegene Nachfrage mehr Produkte verkauft.
The company sold more products due to increased demand.
Here, 'gestiegene' describes 'Zahl' indicating that the number has risen or grown.