Using the data below, determine the peak$-$to$-$average ratio $($based on a four$-$hour average$).$

$\backslash$table$[[$Time$,h,$Flow,$],[600,0\mathrm{.}0191,],[700,0\mathrm{.}03265,],[800,0\mathrm{.}08475,],[900,0\mathrm{.}09825,],[1000,0\mathrm{.}10125,],[1100,0\mathrm{.}10275,],[1200,0\mathrm{.}10125,],[1300,0\mathrm{.}09675,],[1400,0\mathrm{.}09225,],[1500,0\mathrm{.}0666,],[1600,0\mathrm{.}0618,],[1700,0\mathrm{.}0624,],[1800,0\mathrm{.}063,],[1900,0\mathrm{.}0696,],[2000,0\mathrm{.}0762,],[2100,0\mathrm{.}064,],[2200,0\mathrm{.}0605,],[2300,0\mathrm{.}055,],[0,0\mathrm{.}04375,],[100,0\mathrm{.}035,],[200,0\mathrm{.}02625,],[300,0\mathrm{.}0207,],[400,0\mathrm{.}0167,],[500,0\mathrm{.}0159,]]$