A company analyzed its employees' productivity levels over the past year to identify trends and areas for improvement. The productivity metrics were measured in terms of completed projects per quarter for three departments: Sales, Marketing, and Development. The analysis revealed the following quarterly completion data:
Sales: Q1: 20, Q2: 30, Q3: 25, Q4: 35
Marketing: Q1: 15, Q2: 20, Q3: 25, Q4: 30
Development: Q1: 25, Q2: 15, Q3: 20, Q4: 10
Based on this data, which of the following statements is true regarding the productivity trends of the departments?