Statistics for Norwegian (bokmål) Wikipedia, editors that contributed 5 times or more. Based upon work by Erich Zachte The red line is the mean over one year prior to the given date, that means changes in this one-year mean will trail any monthly change. That also means that changes near the current time will use data for the last 12 months. The data values for the yellow line is the difference over one year of the mean. That also means that changes near the current time will use data for the last 24 months.