Question $1.(100$ points$)$ The OFLT Trucking Company needs to determine whether they would increase their fleet size or not. Since their ultimate objective is to satisfy the certain percentage of nationwide transportation demand, they obtained the following data representing total transportation demand in billions of dollars. $($You can copy tables into Excel$)$

Table $1.$ Demand for transportation

$\backslash$table$[[$Year$,$Total transportation demand$],[1980,332\mathrm{.}6],[1985,486\mathrm{.}4],[1990,598\mathrm{.}3],[1991,595\mathrm{.}8],[1992,638\mathrm{.}0],[1993,682\mathrm{.}7],[1994,742\mathrm{.}0],[1995,772\mathrm{.}1],[1996,828\mathrm{.}1],[1997,896\mathrm{.}4],[1998,931\mathrm{.}1],[1999,1,009\mathrm{.}4$