223 years - I was mislead by this: "http://stooq.pl/q/?s=^spx&c=mx&t=l&a=lg&b=0" Probably it's some composite index, as they do with euro.
SP chart for last ten years - it's only S&P. I trade 20+ symbols in reality and that's in this journal.
There have been losing years in the backtest. I...