{
 "source": "Yahoo chart API ^GSPC daily closes, price only (no dividends)",
 "first": "1950-01-03",
 "last": "2026-09-18",
 "days": 19299,
 "pct_days_below_prior_high": 92.0,
 "longest_underwater": {
  "peak": "1973-01-11",
  "recovered": "1980-07-17",
  "trading_days": 1897,
  "years": 7.5
 },
 "max_drawdown_pct": -56.8,
 "max_dd_peak": "2007-10-09",
 "max_dd_trough": "2009-03-09",
 "gfc": {
  "peak": "2007-10-09",
  "peak_close": 1565.15,
  "trough": "2009-03-09",
  "trough_close": 676.53,
  "first_close_above_peak": "2013-03-28",
  "years_to_recover": 5.5
 },
 "pct_up_days": 53.1,
 "pct_10day_windows_higher": 59.1,
 "n_10day_windows": 19290,
 "pullbacks_5pct": 74,
 "pullbacks_5pct_per_year": 0.96
}