Data Visualiser Bubble Chart on Topic Inequality Over Time

Data visualization infographic titled "Streamgraph Topic Over Time" using a BUBBLE CHART as the dominant visual element, designed as a 3D scatter-style bubble plot that clearly shows inequality over time. Render a large central chart with horizontal x-axis labeled "Year" and vertical y-axis labeled "Relative Volume Index", both with sharp tick marks and clear English numeric intervals, plus a visible bubble-size legend labeled "Bubble Size = Topic Share". Use a time sequence from 2018 to 2025 on the x-axis and a full non-truncated y-scale from 0 to 100 to avoid misleading axis manipulation. Plot 5 topic groups in English: "Topic A", "Topic B", "Topic C", "Topic D", "Topic E". Use realistic illustrative values showing strong inequality: Topic A dominates with bubbles around 78, 82, 85, 88, 91, 89, 93, 95; Topic B mid-tier at 28, 31, 35, 33, 37, 40, 42, 44; Topic C at 14, 16, 18, 19, 21, 23, 24, 26; Topic D at 8, 9, 10, 11, 12, 12, 13, 14; Topic E at 3, 4, 4, 5, 5, 6, 6, 7. Make bubble sizes correspond proportionally to share, with Topic A much larger than all others, reinforcing the concentration story. Add subtle depth layering and glow to suggest 3D scatter styling, but keep the visualization analytically readable, not decorative.

Add 4 key insight callouts around the chart, each with a small icon, headline number, and short interpretation in English: 1) icon of crown, headline "95", text "Top topic reaches the highest illustrative volume by 2025." 2) icon of unequal bars, headline "14x", text "Largest topic is roughly fourteen times the smallest, showing steep inequality." 3) icon of upward arrow, headline "+17 pts", text "Leading topic gains steadily over the period." 4) icon of cluster, headline "5 topics", text "Most topics remain compressed in the lower range while one dominates." Clearly mark any metric headline that is not user-sourced as "illustrative" in small text near the number.

Include a compact side annotation panel titled "How to read this chart" with short English labels: "X-axis: time", "Y-axis: relative volume", "Bubble size: topic share", "Larger bubbles indicate greater concentration". Add a small comparison note near the lower-ranked topics: "Lower-tier topics show limited growth despite overall expansion".

Use visual style: dark dashboard, editorial data journalism illustration, FT / Bloomberg-grade chart aesthetics, vector-clean infographic layout. Color palette: deep navy background, Financial Times-inspired pink highlights, muted rose, soft coral, slate blue, and pale off-white labels. Ensure high contrast, crisp gridlines, luminous bubble edges, elegant legends, and restrained newsroom polish. Mood: analytical, premium, unequal-distribution storytelling, modern financial newsroom interface. Use subtle panel dividers, fine dotted gridlines, clean typography, and minimal interface chrome.

Add a small source / data-note strip at the bottom in English reading: "Data note: Illustrative example. Figures shown are not sourced and are for demonstration of inequality over time." Do not cite any fake organizations or fabricated reports.

All text MUST be written in English (array). Every heading, label, caption, legend and metric name in the image must be in English — not English. Spell each English word correctly using English characters and diacritics. Numbers stay as digits, no fake authoritative sources cited, no watermarks Numbers labeled "illustrative" unless the user supplied specific sourced data. No fake authoritative sources cited (do not invent "Source: Reuters 2025" — use "Illustrative example" instead). No misleading axis truncation or scale manipulation.