i was an electrician for many years and i have a philosophy...

on many electrical problems i have seen guys jump in to the most difficulty and the problem would be that the switch was off...

so i recommend that you start with the easiest first...
1. have battery tested... last year is a long time ago...
2. Its probably your battery but if not jump a hot wire to the starter and see what happens...this will bypass the switch and it should turn over.

3. (its probably your starter)

4. ignation swith check

i do not believe it is your ignation switch because you are hereing a clicking noise....which indicates a starter trying to engage... the bendix is not totally poping out... which could mean a bad starter or dead battery... you could have lost an alternater... which lead to a drain on the battery... now in the heat the battery is only producing 9 or 11 volts which will not fire your starter properly....