Based on the given data, the year-on-year variations in percentage are as follows:
- 2025: 4.4%
- 2026: 4.2%
- 2027: 4.0%
- 2028: 3.8%
The Compound Annual Growth Rate (CAGR) from 2024 to 2028 is 4.1%.
Future trends to watch for include technological advancements in metal structure manufacturing, potential fluctuations in global steel prices, and changes in Spain's construction industry demand. Monitoring these factors will be critical for accurately predicting future import needs.
