Success/Failure Ratio for Tech Startups

Hi All,

I was just wondering what is the success/failure ratio for tech startups. I mean how many startups eventually become profitable and are able to sustain for longer periods ( more than a 1000 days )

Some relater queries: 1) How has it changed over the last 2 decades or so ?

2) What does the current trend look like?

3) How does it change when we look at tech startups from a specific country?

Surely there must be some data available on that.