user: I'm currently delving into the cultural traditions across Europe for a historical comparison, focusing on the year 2005. Germany, with its rich history and diverse celebrations, has drawn my attention. I'd like to know which holidays were observed in Germany that year. Could you provide me with a list of the 2005 holidays in Germany?

Available functions:
name: retrieve_holiday_by_year
description: Finds the holidays of a year.
parameters: type: dict
properties: year: type: string
description: The year of the holidays.
country: type: string
description: The country of the holidays. Possible options: US, AT, DE, ES, FR, GB, IT, NL, PL, RO, SK, UA.
required: year
country

Ground truth function call(s):
retrieve_holiday_by_year(year='2005', country='DE')