probably around '92-93 going by the graphics but i'm not sure on colours for this frame of that period. I do have to say though that is one of the worst pictures ever, were you on a trampoline at the time?
It's a 1993 but I haven't seen one in that colour before. It does look like the original paint though, so perhaps the colour was specially for your country?
1993 by the looks of the decals & paint - although the UK spec colour was ti up front faded into red at the rear - is this likely to be a US or Canadian frame?
Here is the 1993 Lava Dome as sold in the US. I don't know which version of the catalogue was sold in Europe excl UK, but in the 1993 US catalogue the colour for every model was listed as (in this case):
White phosphorescent
Titanium
I guess that could mean that every model was available in titanium as an option. I haven't seen proof of that, but perhaps this bike is an example of that titanium colour?