During 1980s electrostatic plotters were introduced into the market. Those were actually large format electrostatic printers which work similar to the ordinary printers. Although they didn't use any pens, they were also referred to as plotters. Later in 1991, HPintroduced the inkjet plotter (HP Designjet), which eventually replaced electrostatic plotters. Since then, HP has been dominating the plotting industry with its DesignJet series.3
25 were sold in its first year
12
3
over 300 the first year
1.8 million copies were sold within the first year of it's release.
428,204 in the first year after it was published
5
they were about 100,0
31 days
29
29
Assuming the fourth year is the first leap year... 21181