Multiwavelength light curve of Mkn 421 from 2009−2015 showing in panel 1): radio fluxes at 15 GHz from the OVRO; panel 2): optical V-band flux from the CCD-SPOL; panel 3): degree and angle of the optical polarization using data from CCD-SPOL; and panel 4): UV flux in the Swift-UVOT UW2 band. Fluxes in the UW1 and WM2 bands follow a similar trend, and thus only one band has been plotted to avoid cluttering. Panel 5): Swift-XRT count rates; panel 6): MAXI count rate (averaged over 10 days); panel 7): Swift-BAT count rates (10 days averaged); panel 8): Fermi-LAT flux in 10^-7 ph/cm²/ s averaged over ten days; and panel 9): HAGAR counts/min, averaged over each observation season. The black dotted line denotes the Crab count rate.