Improve the grammar of this text: Also, tourism sector have made huge contributions to Singapore's economy, with an estimated $ 230 billion in 2007.
The following is a list of the most important events in the history of Singapore.
- 1965: The Singapore government announced the establishment of the Singapore National Museum.
- 1965: The Singapore government established the Singapore National Museum.
- 1965: The Singapore government established the Singapore National Library.
- 1966: The Singapore government established the Singapore National University.
- 1967: The Singapore government established the
The article is based on the following sources:
- The Singapore government has been working on the development of the tourism industry in Singapore since 1997. The government has been working on the development of the tourism industry in Singapore since 1997. The government has been working on the development of the tourism industry since 1997.
- The government has been working on the development of the tourism industry since 1997. The government has been working on