Data Visualization Using Excel: Sankey Trend Line Outlier

Data visualization infographic titled "Sankey Diagram Example" using a TREND LINE (over time) as the dominant visual element to explain an outlier pattern related to flow volume over time. Show a clean horizontal time axis labeled "Month" with tick marks "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" and a vertical axis labeled "Flow Volume (illustrative units)" with clear evenly spaced tick marks from 0 to 100. Plot one main neon line labeled "Total Flow" with realistic illustrative values: 22, 24, 23, 26, 25, 27, 29, 31, 68, 34, 33, 35, making September the clear surprise outlier spike. Add a subtle dashed benchmark line labeled "Typical Range" around 20 to 35. Ensure no misleading axis truncation, full baseline at zero, and honest scale presentation.

Add 4 key insight callouts with small icons, each in English: 1) headline number "68" with short interpretation "September spike is nearly double the usual level" and a lightning icon, 2) headline number "+37" with short interpretation "Largest month-to-month jump from August to September" and an upward arrow icon, 3) headline number "35" with short interpretation "Flows return close to baseline by December" and a reset icon, 4) headline number "20-35" with short interpretation "Most months stay within a stable operating band" and a range icon. Place the callouts around the chart without obscuring data.

Include a small secondary annotation panel titled "Why this matters" with a concise English note: "A Sankey diagram often shows how quantities split and move across stages. This example instead highlights when total flow changes sharply over time before drilling into categories." Keep this as supporting context, smaller than the main chart.

Add a compact SOURCE / DATA-NOTE strip at the bottom in English reading: "Data note: Illustrative example for layout and storytelling only. Figures are illustrative unless sourced by the user." 

Visual style: Reuters / Economist editorial, dark mode neon palette, deep charcoal or black background, electric cyan main line, neon magenta outlier highlight, lime and amber accents for annotations, crisp white typography, restrained gridlines, high contrast, analytical and surprising mood. Use editorial data journalism illustration, FT / Bloomberg-grade chart aesthetics, vector-clean infographic layout. Render sharp axis labels and tick marks, precise legends, balanced spacing, and polished newsroom-style composition.

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.