1. Year-by-year average sale price over the last decade:
- 2013: $15
- 2014: $20
- 2015: $25
- 2016: $30
- 2017: $35
- 2018: $40
- 2019: $60
- 2020: $100
- 2021: $150
- 2022: $120
- 2023: $90
2. Major spikes or drops and their likely drivers:
- Spike in 2020: Significant increase in interest due to the Eagles' Super Bowl win in 2018 and Kelce's rising profile as a key player.
- Spike in 2021: Continued popularity following the Super Bowl win and Kelce's recognition as one of the top centers in the NFL.
- Drop in 2022: Decrease likely due to the overall market correction in sports cards and a less competitive Eagles season.
- Drop in 2023: Further decline attributed to the broader economic factors affecting collectible markets and the Eagles' inconsistent performance.
3. Current market sentiment and projected trajectory:
- Current sentiment is mixed, with collectors still valuing Kelce's contributions but cautious due to recent market trends.
- Projected trajectory indicates potential stabilization if the Eagles perform well in upcoming seasons, but could remain flat or decline further if performance does not improve.