Site Years:   2019  2018  2017  2016 
Year: 2019 ( top )

Jan ( N = 2836 )

Feb ( N = 2679 )

Mar ( N = 2970 )

Apr ( N = 2613 )

May ( N = 2966 )

Jun ( N = 2870 )

Jul ( N = 2957 )

Aug ( N = 2934 )

Sep ( N = 2837 )

Oct ( N = 2508 )

Nov ( N = 2876 )

Dec ( N = 385 )

Year: 2018 ( top )

Jan ( N = 2974 )

Feb ( N = 2686 )

Mar ( N = 2946 )

Apr ( N = 2871 )

May ( N = 2959 )

Jun ( N = 2647 )

Jul ( N = 2884 )

Aug ( N = 2904 )

Sep ( N = 2870 )

Oct ( N = 2964 )

Nov ( N = 2715 )

Dec ( N = 2949 )

Year: 2017 ( top )

Jan ( N = 2964 )

Feb ( N = 2528 )

Mar ( N = 2379 )

Apr ( N = 2879 )

May ( N = 2976 )

Jun ( N = 2870 )

Jul ( N = 2976 )

Aug ( N = 2956 )

Sep ( N = 2760 )

Oct ( N = 2939 )

Nov ( N = 2706 )

Dec ( N = 2737 )

Year: 2016 ( top )

Dec ( N = 1768 )

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This material is based upon work supported by the National Science Foundation under Grant No. EF-1065029. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.