Perfectly normal!
I was diagnosed almost 9 years ago, and during the first 6 years my long acting need slowly rose to around 115. Which worked well for me for a bit until it slowly dropped again (I lost some weight and lost a depression, not sure which made the most impact) to around 56 at the moment.
I've been very well managed all this time, and I'm happy to increase or lower my dose again as soon as I see I need a bit more or less.
Are you on long acting only or on basal and bolus?