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拉长时间线来看，有披露研发人员的企业数量从2021 年度的3895 家增至2025 年度的5309 家，五年间增长36.30%，增幅高于入库企业总数变动（20.81%）。随着这一增长，有披露研发人员的企业占比呈逐年攀升的态势，从66.60%增至75.15%。
The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.