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:
| District | Incumbent | Party | First elected | Results | Candidates |
| --- | --- | --- | --- | --- | --- |
| Washington 1 | Jay Inslee | Democratic | 1998.0 | Re-elected | Jay Inslee (D) 67.7% Larry Ishmael (R) 32.3% |
| Washington 2 | Rick Larsen | Democratic | 2000.0 | Re-elected | Rick Larsen (D) 64.2% Doug Roulstone (R) 35.8% |
| Washington 3 | Brian Baird | Democratic | 1998.0 | Re-elected | Brian Baird (D) 63.1% Michael Messmore (R) 36.9% |
| Washington 4 | Doc Hastings | Republican | 1994.0 | Re-elected | Doc Hastings (R) 59.9% Richard Wright (D) 40.1% |
| Washington 5 | Cathy McMorris | Republican | 2004.0 | Re-elected | Cathy McMorris (R) 56.4% Peter Goldmark (D) 43.6% |
| Washington 6 | Norm Dicks | Democratic | 1976.0 | Re-elected | Norm Dicks (D) 70.6% Doug Cloud (R) 29.4% |
Question:
How many categories of first elected are in Washington 4 district? 
Answer:
1.0