My guess is that it's a 1999.
The blue and yellow colourscheme could be a little tribute to the fact that the world Championship took place in åre, Sweden that year..
All cannondales in the Championship had that combination.
Well, it could be seen as an homage to Volvo as well, beeing a swedish car, as they were partners in 98 to, but the team bikes were red or red fading to orange that year.
In 2001 they were the same blue with yellow logos but front end fading in black.
I used to own Cedric Gracias team dh Bike from 99,the fulcrum II, in that fancy combination, wish i never sold it.
Edit: looking closer at the picture i notice it's lacking the white Volvo logo, so perhaps more likely 2000..