Drew Brees had the highest completion percentage by a quarterback in 2018, at 74.4 percent.

which quarterback led the nfl in completion percentage in the 2018 season
Interpreted as:
Which quarterback led the NFL in completion percentage with a minimum of 14 passing attempts per team game in the 2018 season?
2018Brees2018Cousins2018Wentz2018Ryan2018Carr2018Mariota2018Watson2018Rivers2018Newton2018Prescott2018Luck2018Roethlisberger2018Fitzpatrick2018Trubisky2018Stafford2018Mahomes2018Manning2018Brady2018Wilson2018Goff2018Winston2018Tannehill2018Mullens74.470.169.669.468.968.968.368.367.967.767.367.066.766.666.166.066.065.865.664.964.664.264.2
NAMESEASONTMGPPCTCMPATTYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Drew BreesDrew Brees2018NONO1574.43644893,9928.2266.1326.551.017121115.7
Kirk CousinsKirk Cousins2018MINMIN1670.14256064,2987.1268.6305.0101.74026299.7
Carson WentzCarson Wentz2018PHIPHI1169.62794013,0747.7279.5215.271.731202102.2
Matt RyanMatt Ryan2018ATLATL1669.44226084,9248.1307.8355.871.242296108.1
Derek CarrDerek Carr2018OAKOAK1668.93815534,0497.3253.1193.4101.85129993.9
Marcus MariotaMarcus Mariota2018TENTEN1468.92283312,5287.6180.6113.382.44224392.3
Deshaun WatsonDeshaun Watson2018HOUHOU1668.33455054,1658.2260.3265.191.862384103.1
Philip RiversPhilip Rivers2018LACLAC1668.33475084,3088.5269.3326.3122.432204105.5
Cam NewtonCam Newton2018CARCAR1467.93204713,3957.2242.5245.1132.82921394.2
Dak PrescottDak Prescott2018DALDAL1667.73565263,8857.4242.8224.281.55634796.9
Andrew LuckAndrew Luck2018INDIND1667.34306394,5937.2287.1396.1152.31813498.7
Ben RoethlisbergerBen Roethlisberger2018PITPIT1667.04526755,1297.6320.6345.0162.42416696.5
Ryan FitzpatrickRyan Fitzpatrick2018TBTB866.71642462,3669.6295.8176.9124.91476100.4
Mitchell TrubiskyMitchell Trubisky2018CHICHI1466.62894343,2237.4230.2245.5122.82414395.4
Matthew StaffordMatthew Stafford2018DETDET1666.13675553,7776.8236.1213.8112.04025589.9
Patrick MahomesPatrick Mahomes2018KCKC1666.03835805,0978.8318.6508.6122.126171113.8
Eli ManningEli Manning2018NYGNYG1666.03805764,2997.5268.7213.6111.94735892.4
Tom BradyTom Brady2018NENE1665.83755704,3557.6272.2295.1111.92114797.7
Russell WilsonRussell Wilson2018SEASEA1665.62804273,4488.1215.5358.271.651355110.9
Jared GoffJared Goff2018LARLAR1664.93645614,6888.4293.0325.7122.133223101.1
Jameis WinstonJameis Winston2018TBTB1164.62443782,9927.9272.0195.0143.72715790.2
Ryan TannehillRyan Tannehill2018MIAMIA1164.21762741,9797.2179.9176.293.33527992.7
Nick MullensNick Mullens2018SFSF864.21762742,2778.3284.6134.7103.61712790.8
Baker MayfieldBaker Mayfield2018CLECLE1463.83104863,7257.7266.1275.6142.92517393.7
Alex SmithAlex Smith2018WASWAS1062.52053282,1806.6218.0103.051.52212185.7
StatMuse has season-level data for completion percentage and pass attempts per team game going back to the 1932 season.

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