Year Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec. 24-Hour Annual Avg. 
2011  15809 16563 17453 17657 17648 17020 17108 17080 16939 15212 14815  
2012 14001 15343 15338 16165 16690 16926 16299 16800 16943 16865 15915 15616 16075 
2013 14451 16072 16575 16954 17739 17817 16962 17334 17383 17161 16221 15497 16681 
2014 14824 16009 16933 17642 18162 18178 17305 17428 17629 17358 16042 16070 16965 
2015 15494 17139 17501 18027 18330 18129 17743 17817 17965 17838 16805 16259 17421 
2016 15573 17118 17591 18453 19120 18996 18307 18518 18686 18347 17541 16289 17878 
2017 14976 16937 18261 19082 19728 19505 18875 19186 18904 18496 17591 17138 18223 
2018 16404 17533 18725 18891 19376 19373 18813 19121 19163 18985 17900 17181 18455 
2019 16834 17329 18824 19745 20092 20172 19278 19671 19670 19319 18285 17763 18915 
2020 17290 18421 17049 15054 18036 19113 18633 18947 19579 19553 17433 17233 18029 
2021 17151 17585 20157 20825 21176 21251 20257 19535 19940 20069 19803 19427 19765 
2022 17387 18561 19424 20082 20682 20090 19373 19644 19923 20092 18064 17295 19218 
2023 17414 18324 18768 20101 21081 20645 20003 20275 20373 20192 18895 18244 19526 
2024 16798 18910 19784