Timeline for all types of items produced by
Roland

Year	Items
1980	1
1982	3
1983	1
1984	4
1985	5
1986	4
1987	10
1988	4
1989	17
1990	2
1991	4
1992	6
1993	1
1994	2
1995	2
1996	2

68 items with a valid date were considered for this timeline (100.00% of the total)