https://news.ycombinator.com/item?id=5536734 https://news.ycombinator.com/item?id=5536734 Based on that. And this - https://news.ycombinator.com/item?id=23220

https://news.ycombinator.com/item?id=5536734 https://news.ycombinator.com/item?id=5536734 Based on that. And this - https://news.ycombinator.com/item?id=2322031 https://news.ycombinator.com/item?id=2322031 Which has more links to older surveys. Thus 40.