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:
| Name | Appointed/Elected | Term expires | Appointing Governor | Governor's Party Affiliation |
| --- | --- | --- | --- | --- |
| Chief Justice Mark Cady | 1998 | December 31, 2016 | Terry Branstad | Republican |
| David Wiggins | 2003 | December 31, 2020 | Tom Vilsack | Democratic |
| Daryl Hecht | 2006 | December 31, 2016 | Tom Vilsack | Democratic |
| Brent R. Appel | 2006 | December 31, 2016 | Tom Vilsack | Democratic |
| Bruce B. Zager | February 2011 | December 31, 2020 | Terry Branstad | Republican |
| Edward Mansfield Category:Articles with hCards | February 2011 | December 31, 2020 | Terry Branstad | Republican |
| Thomas D. Waterman | February 2011 | December 31, 2020 | Terry Branstad | Republican |
Question:
What is the year when chief justice Mark Cady was appointed/elected?
Answer:
1998.0