Timeline for all types of items produced by
Superior Soft.

Year	Items
1981	1
1982	11
1983	20
1984	34
1985	17
1986	20
1987	40
1988	40
1989	36
1990	12
1991	4
1992	3
1993	1

239 items with a valid date were considered for this timeline (90.53% of the total)
25 items with an invalid date.

Help us in our quest to find exact dates for:

198?: 23 items.
199?: 2 items.