Not sure on the color break-down numbers, but the '93 model year had the highest production, each year thereafter dropping off.
Based on a Cadillac facts website, here's the overall numbers I got for the Fleetwood:
1993- 29,744
1994- 23,177
1995- 13,445
1996- 12,596
Here's the site:
http://myweb.accessus.net/~090/cfb.html
Your white/black combo is VERY rare, as is my white/garnet red from what I've seen over the years. Mine also has a very high vin#, right around the 29k mark, rolling off the line right before the start of the '94s.