Waterfall: breaking down monthly P&L

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    "values": [
      { "etape": "Capital initial", "debut": 0, "fin": 25000, "type": "total" },
      { "etape": "Janvier", "debut": 25000, "fin": 26200, "type": "hausse" },
      { "etape": "Février", "debut": 26200, "fin": 25400, "type": "baisse" },
      { "etape": "Mars", "debut": 25400, "fin": 27100, "type": "hausse" },
      { "etape": "Avril", "debut": 27100, "fin": 26500, "type": "baisse" },
      { "etape": "Mai", "debut": 26500, "fin": 28300, "type": "hausse" },
      { "etape": "Juin", "debut": 28300, "fin": 29150, "type": "hausse" },
      { "etape": "Solde final", "debut": 0, "fin": 29150, "type": "total" }
    ]
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    "y": { "field": "debut", "type": "quantitative", "title": "Solde ($)" },
    "y2": { "field": "fin" },
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