i have a 2004 dodge stratus and i keep blowing my last #20 fuse?

iput an alarm and a radio system in it last year... this year i keep blowing my fuses. everytime the last #20 fuse blows my car wont start until i put in a new #20 fuse in that slot. is there a reason why this would be happening.. ive gone through 6 fuses in 6 months.
 
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