What is average spent on 2001 or older motorhome maintenance

I do my own maintenance and repairs. It is a 1991 and 100% functioning. In the last six years I have replaced an air horn compressor ($80.00), cruise control cable ($39.00), idler pulley ($14.00), fan belt ($28.00), door latch stop ($.85), back up camera ($225) and batteries ($240.00). My repair costs has averaged
$104.48 annually.