The following table shows the sales for a plastics manufacturer recorded over the past year. The seasonal indexes for each quarter are also provided. To track the trend for these four quarters, use the indexes to deseasonalize the sales data. 
Overall, sales are ___________.
Definitions:
Class Average
The mean score or grade of a group of students.
High Reliability
Describes organizations or systems with processes and practices in place that make them exceptionally consistent in achieving their goals, especially in avoiding catastrophes in high-risk environments.
Psychological Test
A standardized procedure designed to measure an individual's mental performance, personality characteristics, or behavioral style.
Reliability
The degree to which an assessment tool produces stable and consistent results over time.
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