Timeline for all types of games by Hewlett-Packard

Year	Prod.
1966	1
1973	2
1974	2
1975	6
1976	24
1977	47
1978	17
1979	7
1980	19
1981	2
1982	22
1983	4
1984	17
1985	19
1986	5
1987	5
1988	6
1989	4
1990	2
1991	7
1992	5
1993	4
1994	2
1995	4
1998	4
1999	2
2000	1
2009	1

241 games with valid date were considered for this timeline (12.20% of the total)
1735 games with invalid date.

Please help us in our quest to found exact dates for:

197?: 865 games.
198?: 870 games.

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