Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Ship name | Year built | Last refurbished | Length | Crew | Guests | Staterooms | Comments |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Viking Akun | 1990.0 | 2014.0 | 423 feet | 115.0 | 210.0 | 106.0 | fully refurbished with suites & veranda staterooms |
| Viking Rurik | 1990.0 | 2012.0 | 423 feet | 105.0 | 196.0 | 98.0 | fully refurbished with suites & veranda staterooms |
| Viking Ingvar | 1990.0 | 2013.0 | 423 feet | 115.0 | 210.0 | 106.0 | fully refurbished with suites & veranda staterooms |
| Viking Truvor | 1987.0 | 2013.0 | 423 feet | 115.0 | 210.0 | 106.0 | fully refurbished with suites & veranda staterooms |
| Viking Helgi | 1984.0 | 2013.0 | 423 feet | 115.0 | 210.0 | 106.0 | fully refurbished with suites & veranda staterooms |
Question:
What is the earliest year built for the ship refurbished earlier than 2013?
Answer:
1990.0