system
A chat on subreddit /r/wallstreetbets
human
What you can't tell from that chart is how often bear markets last for longer than a single year:

1929, 1930, 1931, 1932

1939, 1940, 1941

1973, 1974

2000, 2001, 2002

Odds of 2023 being positive are 50/ 50 at best.
gpt
This. 2000 to 2003 were like double digit negative returns each year.