You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was australia day first celebrated as a public holiday?" whose answer is 1818.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was australia day first celebrated as a public holiday
Useful Output:

Doc 1: History of 'Australia Day'. Australia Day as a national public holiday was not consistently celebrated across Australia until 1994. But where
Doc 2: The first recorded celebration of 26 January occurred in 1808. By 1935, all Australian states recognised the date as “Australia Day.” It wasn't until 1994,
Doc 3: 26 January was first gazetted as a public holiday for New South Wales by Governor Macquarie in 1818, when it was referred to as First Landing Day or Foundation
Doc 4: The Commonwealth and state governments agreed to unify the celebrations on 26 January as "Australia Day" in 1946, although the public holiday was instead taken
Doc 5: It was not until 1994 that all jurisdictions celebrated Australia Day as a public holiday on January 26 itself. The designation of January 26 as